JP2016179833A - Container with lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container with a lid having a steam venting function.SOLUTION: A container includes a bottom surface 21, a side surface 23 raised from the bottom surface in a manner to extend around a circumference along an outer edge of the bottom surface, and a flange part 25 which is provided to continue from an upper part of the side surface and where a lid is joined. The outline of the flange part of the container includes a pair of long sides 25a and a pair of short sides 25b, and a joining line for joining the lid and the flange part is formed continuously around the periphery between the lid and the flange part of the container. The joining line includes a principal line 32 extending along the outer edge of the flange part and a projecting line 34 which is placed on the long side of the flange part and projects from the principal line toward the inside. In addition, when a shortest distance from a central point of the container to an outer edge of the projecting line of the joining line is defined as D1, and a shortest distance from the central point of the container to an inner edge of the principal line on the short side of the flange part is defined as D2, a ratio of D2 to D1 is 1.50 or more.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a container with a lid provided with a container in which a housing part is formed and a lid joined to the container so as to seal the container housing part.

  Conventionally, many items such as cooked or semi-cooked foods are stored in a plastic container such as a tray and sealed with a lid made of a film or the like. The contents are heated by a microwave oven or the like while being stored in a plastic container.

  By the way, when the contents housed in the container sealed by the lid are heated using a microwave oven, the moisture contained in the contents evaporates with the heating, and the pressure in the container housing portion increases. Go. When the pressure in the container accommodating portion is increased, the lid and the container may burst and the contents may be scattered to contaminate the inside of the microwave oven. In consideration of such a problem, it has been proposed to provide a steam venting function that allows the housing portion and the outside to communicate with each other to release the steam in the housing portion to the outside when the pressure of the housing portion of the pouch reaches a predetermined value or more.

  For example, Patent Documents 1 to 3 propose that a protruding line that protrudes inside the container is formed in a part of a belt-like heat seal line that welds the lid and the flange portion of the container by thermal welding. In this case, when the pressure of the container accommodating portion increases with heating and the lid partially swells upward from the flange portion of the container, the protruding line is first peeled off from the lid or the flange portion. As a result, a steam hole for releasing steam to the outside is formed between the lid and the flange portion of the container at the place where the protruding line is provided. As described above, by providing a part of the heat seal line that is more easily separated than the other part, it is possible to stably release the steam to the outside at the target part.

Japanese Patent Publication No. 8-25583 JP-A-9-221177 Japanese Patent No. 4665538

  In the containers described in Patent Documents 1 to 3, the flange portion of the container has a substantially square outline. In this case, if the lid swells when the contents are heated using a microwave oven, the peeling force that tries to peel the lid from the container based on the bulge of the lid is not the protruding line of the heat seal line. It seems that there are things that work first in this part. In this case, it is conceivable that portions other than the protruding line are peeled off from the lid or the flange portion before the protruding line, thereby causing the steam to escape from an unintended location. It is also conceivable that the lid may rupture before the protruding line is peeled off.

  An object of this invention is to provide the container with a lid which can solve such a subject effectively.

  The present invention includes a container in which a housing part is formed, and a lid joined to the container so as to seal the housing part of the container, and the container includes a bottom surface and an outer edge of the bottom surface. A side surface erected from the bottom surface so as to spread over the circumference, and a flange portion connected to the upper portion of the side surface and joined to the lid, and the contour of the flange portion of the container has a pair of lengths A joining line that joins the lid and the flange portion is formed continuously over the circumference between the lid and the flange portion of the container. The joint line includes a main line extending along an outer edge of the flange portion, and a projecting line disposed on the long side of the flange portion and projecting inward from the main line, and the container The joint line from the center point of When the shortest distance to the outer edge of the protruding line is D1, and the shortest distance from the center point of the container to the inner edge of the main line on the short side of the flange portion is D2, the ratio of D2 to D1 is 1. A container with a lid of 50 or more.

  In the container with a lid according to the present invention, the protruding lines of the joining line may be respectively disposed on the pair of long sides of the flange portion.

  In the lidded container according to the present invention, the protruding line of the joining line includes a pair of first parts extending inward from the main line, and a second part connecting the pair of first parts, The second portion may have a curved shape that protrudes inward.

  In the lidded container according to the present invention, the flange portion has a protruding portion formed on the long side so as to protrude inward, and the protruding line of the joining line is above the protruding portion of the flange portion. May be arranged.

  In the container with a lid according to the present invention, the projecting portions may be respectively formed on the pair of long sides of the flange portion.

  In the container with a lid according to the present invention, a width of the protruding portion of the flange portion may be in a range of 10 to 15 mm.

  In the lidded container according to the present invention, the shortest distance from the outer edge of the protruding portion of the flange portion to the outer edge of the protruding line of the joining line may be within a range of 5 to 10 mm.

  The flange portion of the container according to the present invention has a rectangular outline including a pair of long sides and a pair of short sides. In addition, a joining line for joining the lid and the flange portion is continuously formed over the circumference between the lid and the flange portion of the container. The joining line has a main line extending along the outer edge of the flange portion, and a protruding line that is disposed on the long side of the flange portion and protrudes inward from the main line. When the shortest distance from the center point of the container to the outer edge of the protruding line of the joining line is D1, and the shortest distance from the center point of the container to the inner edge of the main line on the short side of the flange portion is D2, The ratio of D2 is 1.50 or more. For this reason, when the contents are heated, the protruding line can be easily separated from the flange portion before the portion other than the protruding line. Thereby, a steam hole can be stably formed in the place where the protruding line is provided. Thereby, the usability of the lidded container can be improved.

FIG. 1 is a perspective view showing an example of a container according to an embodiment of the present invention. FIG. 2 is a plan view showing an example of a container with a lid in the embodiment of the present invention. FIG. 3 is a cross-sectional view showing a case where the lidded container shown in FIG. 2 is viewed along the line III-III. 4 is an enlarged plan view showing a protruding line of a joining line of the lidded container shown in FIG. FIG. 5 is a view for explaining the shape of the protruding line of the joining line and the protruding part of the flange portion. FIG. 6 is a plan view showing a state where a bulge is formed on the lid by heating the contents. FIG. 7A is a plan view showing a state in which the bulging portion of the lid has reached the outer edge of the second portion of the protruding line of the joining line. FIG. 7B is a cross-sectional view showing a case where the lidded container shown in FIG. 7A is viewed along the line VIIB-VIIB. FIG. 8A is a plan view showing a state where a recess is formed in the lid as the contents cool down. FIG. 8B is a cross-sectional view showing the lidded container shown in FIG. 8A as viewed along the line VIIIB-VIIIB. FIG. 9 is a plan view showing another example of the lidded container in the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 8A. First, with reference to FIG. 2 and FIG. 3, the outline of the container 10 with a lid | cover in this Embodiment is demonstrated. FIG. 2 is a plan view showing the lidded container 10 according to the present embodiment, and FIG. 3 is a cross-sectional view showing the lidded container 10 shown in FIG. 2 as viewed along line III-III.

(Container with lid)
As shown in FIGS. 2 and 3, the container 10 with a lid includes a container 20 in which a housing portion 28 is formed, and a lid 50 joined to the container 20 so as to seal the housing portion 28 of the container 20. ing. In the present specification, “joining” is a concept including both welding and adhesion. “Welding” means attaching the lid 50 to the container 20 by at least partially melting at least one of the container 20 and the lid 50. The term “adhesion” means that the lid 50 is attached to the container 20 by using a component such as an adhesive that is separate from the container 20 and the lid 50.

  The contents stored in the container 20 are not particularly limited, but examples of the contents include retort food, frozen food, and refrigerated food. Examples of the food include curry, rice cake, yakisoba, side dish, and fish. In these contents, moisture evaporates with heating, and the pressure of the storage portion 28 of the container 20 increases, so that the container 10 with a lid is required to have a steam venting function for releasing the steam in the storage portion 28 to the outside.

(container)
Next, the container 20 will be described with reference to FIGS. FIG. 1 is a perspective view showing a container 20 of the lidded container 10 of FIG. The container 20 includes a bottom surface 21, a side surface 23 erected from the bottom surface 21 so as to spread around the outer edge of the bottom surface 21, and a flange portion 25 continuously provided on the side surface 23 and having a flat top surface. Have. The lid 50 described above is joined to the upper surface of the flange portion 25 of the container 20. FIGS. 1 and 2 show an example in which the flange portion 25 is connected to the upper edge of the side surface 23 and extends in the horizontal direction toward the outside. In this specification, terms such as “side surface”, “upper portion”, “upper edge”, “upper surface”, “lower surface” and “horizontal direction” are attached so that the bottom surface 21 of the container 20 is positioned below. The positions and directions of the lidded container 10, the container 20, the lid 50 and their constituent elements are shown with reference to the state where the container 10 and the container 20 are placed.

  In the present embodiment, the contour of the flange portion 25 includes a pair of long sides 25a and a pair of short sides 25b. For example, as shown in FIGS. 1 and 2, the flange portion 25 has a substantially rectangular outline including a pair of long sides 25a and a pair of short sides 25b. In FIG. 2, a symbol L1 represents the length of the long side 25a, a symbol L2 represents the length of the short side 25b, and the length L1 is larger than the length L2. In FIG. 1 and FIG. 2, the code | symbol 25c represents the corner located between the long side 25a and the short side 25b. As shown in FIGS. 1 and 2, the corner 25 c may have a curved shape. Such a corner 25c is obtained by, for example, chamfering the corner of the flange having a rectangular outline. Although not shown, the corner 25c may have an angular shape.

  As will be described later, as a method for manufacturing the container 20, injection molding using a thermoplastic resin such as polypropylene may be employed. When the container 20 is manufactured by injection molding, the height H of the container 20 is preferably set to be equal to or less than the length L2 of the short side 25b of the flange portion 25 of the container 20 in order to ensure moldability.

  As will be described later, in the present embodiment, a protruding line arranged at a portion where a steam hole is to be formed is formed on the long side 25a. Even if the length L1 of the long side 25a and the length L2 of the short side 25b are varied in how the lid 50 swells when the contents are heated using a microwave oven, the length L1 on the long side 25a The protruding line is set so as to be peeled off from the lid 50 or the flange portion 25 before the other part of the joining line. For example, the ratio is set so that the ratio of D2 to D1, which will be described later, falls within a desired range.

  FIG. 2 shows an example in which the pair of long sides 25a are parallel to each other, the pair of short sides 25b are parallel to each other, and the long sides 25a and the short sides 25b are orthogonal to each other. It is not limited to this. As long as a later-described protruding line 34 disposed on the long side 25a can be peeled off before the main line 32 on the short side 25b, the directions of the long side 25a and the short side 25b can be set variously. . For example, the pair of long sides 25a may be non-parallel to each other, and the pair of short sides 25b may be non-parallel to each other. Further, the angle formed by the long side 25a and the short side 25b may be shifted from 90 degrees.

  2 shows an example in which the outer edge 25y of the flange portion 25 extends linearly from one corner portion 25c to the other corner portion 25c, but is not limited thereto. Although not shown, a recess or the like may be partially formed in the outer edge 25y of the flange portion 25. That is, in the present specification, the form expressed by the phrase “the contour of the flange portion 25 includes a pair of long sides 25a and a pair of short sides 25b” means that the outer edge 25y of the flange portion 25 extends from one corner portion 25c to the other. It is not limited to the form extending linearly to the corner 25c. The flange part 25 should just have the outline containing a pair of long side 25a and a pair of short side 25b, when the shape of the flange part 25 is seen roughly.

  As shown in FIGS. 1 and 2, the flange portion 25 has a protruding portion 26 formed on the long side 25 a so as to protrude inward. In the present specification, “inner side” means the side closer to the container 28 of the container 20 in the horizontal direction. Further, “outside” means a side far from the accommodating portion 28 of the container 20 in the horizontal direction.

  In FIG. 1 and FIG. 2, the example in which the protrusion part 26 is each formed in a pair of long side 25a of the flange part 25 is shown. However, the present invention is not limited to this, and although not illustrated, the protruding portion 26 may be formed only on one of the pair of long sides 25 a of the flange portion 25. In addition, in order to form a steam hole stably in the place where the later-described projecting line 34 is formed, the projecting portions 26 are respectively formed on the pair of long sides 25a of the flange portion 25, and on the pair of projecting portions 26. It is preferable that the protruding lines 34 are respectively arranged on the two.

(Joining line)
As shown in FIGS. 2 and 3, a joining line 30 that joins the lid 50 and the flange portion 25 is continuously formed around the circumference between the lid 50 and the flange portion 25 of the container 20. The joining line 30 may be formed by at least partially melting at least one of the container 20 and the lid 50. Moreover, the joining line 30 may be formed by a component separate from the container 20 and the lid 50 such as an adhesive. By forming the joining line 30 between the lid 50 and the flange portion 25, the accommodating portion 28 of the container 20 can be sealed without a gap. In addition, in FIG. 3, although the example in which the joining line 30 is formed so that it may straddle both the lid | cover 50 and the flange part 25 is shown, it is not restricted to this. For example, the joining line 30 may be formed only on the lid 50 side, or may be formed only on the flange portion 25 side.

  As shown in FIG. 2, the joining line 30 is disposed on the main line 32 extending along the outer edge 25 y of the flange portion 25 and the long side 25 a of the flange portion 25, and protrudes inward from the main line 32. Line 34. The protruding line 34 is configured to be peeled off first when the pressure of the accommodating portion 28 of the container 20 increases with heating. The specific shape of the protruding line 34 will be described later.

  As shown in FIG. 2, the protruding line 34 is preferably disposed on the protruding portion 26 of the long side 25a. 2 shows an example in which the protruding lines 34 are respectively disposed on the pair of long sides 25a of the flange portion 25. However, the present invention is not limited to this, and although not illustrated, the protruding line 34 may be disposed only on one of the pair of long sides 25 a of the flange portion 25.

  As shown in FIGS. 1 to 3, a raised portion 21 b that is raised upward may be formed on the bottom surface 21 of the container 20. In addition, a plurality of concave portions 21a may be formed in the raised portion 21b. Thereby, when cooking the contents using a microwave oven, it can suppress that the container 20 deform | transforms when the pressure of the accommodating part 28 increases. As shown in FIG. 1, a step portion 23 a may be formed on the side surface 23 of the container 20.

(lid)
Next, the lid 50 joined to the container 20 will be described. The material constituting the lid 50 is selected so that the lower surface of the lid 50 can be bonded to at least the upper surface of the flange portion 25 of the container 20. For example, the lid 50 includes a base material layer and a sealant layer constituting the lower surface of the lid 50. The thickness of the lid 50 is, for example, in the range of 20 to 100 μm.

  As a material constituting the base material layer, polyester resins such as polyethylene terephthalate, polyamide resins such as nylon, polypropylene, and the like can be used. As a material constituting the sealant layer, polypropylene, a mixed resin of polypropylene and polyethylene, or the like can be used. When both the base material layer and the sealant layer include polypropylene, biaxially stretched polypropylene is used for the base material layer, and unstretched polypropylene is used for the sealant layer.

(Shape of protrusion and protrusion line)
Next, with reference to FIG. 4 and FIG. 5, the shape of the protrusion part 26 of the flange part 25 and the shape of the protrusion line 34 of the joining line 30 are demonstrated in detail. 4 is an enlarged plan view showing 30 protruding lines 34 of the joining line of the lidded container 10 shown in FIG. FIG. 5 is an enlarged view of the protruding line 34 as in FIG. 4, and is a view for explaining the shapes of the protruding line 34 and the protruding portion 26.

  As shown in FIG. 4, the protruding line 34 of the joining line 30 includes a pair of first portions 35 extending inward from the main line 32 and a second portion 36 connecting the pair of first portions 35. It is out. For this reason, the protruding line 34 has a substantially triangular shape protruding toward the inside. In this case, when the pressure of the accommodating portion 28 of the container 20 increases with heating, the tip portion of the substantially triangular shape protruding inside, that is, the second portion 36 in the protruding line 34, that is, the second portion 36 is peeled off. Then, the lid 50 is peeled off from the protruding portion 26 of the flange portion 25.

  In FIG. 2, the symbol P represents the protruding length of the protruding line 34 with respect to the main line 32. The protruding length P is defined by the inner edge 30x of the second portion 36 of the protruding line 34 of the joining line 30 and the inner edge 30x of the main line 32 connected to the first portion 35 of the protruding line 34 in the direction in which the short side 25b extends. Defined as the distance between.

  In FIG. 5, θ <b> 1 represents an angle formed by a pair of first portions 35 extending inward from the main line 32. When the angle θ <b> 1 is large, the certainty that the protruding line 34 first peels off in the joining line 30 when the pressure of the accommodating portion 28 increases is lowered. On the other hand, when the angle θ1 is small, the protruding line 34 is partially formed on the basis of an impact applied to the lidded container 10 while the lidded container 10 is being transported, for example, before the lidded container 10 is heated. There is a high possibility of peeling. Considering these points, the angle θ1 between the pair of first portions 35 is preferably set within a range of 70 to 110 degrees, and more preferably set within a range of 80 to 100 degrees. .

  Moreover, in order to suppress that the 2nd part 36 peels in the step before the container 10 with a lid | cover is heated, as shown to FIG. 4 and FIG. It is preferable to have a curved shape that is convex toward the surface. Thereby, the impact resistance of the second portion 36 can be increased. The curvature radius r of the curved shape of the second portion 36 is, for example, equal to or less than the width W3 of the second portion 36 of the protruding line 34.

  As shown in FIG. 4, the inner edge 25x of the protruding portion 26 of the flange portion 25 of the container 20 includes a pair of first sides 26a extending inward, a second side 26b connecting the pair of first sides 26a, Is included. As in the case of the second portion 36 of the protruding line 34, the second side 26b of the protruding portion 26 preferably has a curved shape that protrudes inward.

  In FIG. 5, θ2 represents an angle formed by a pair of first sides 26a extending inward. In general, the angle θ2 between the pair of first sides 26a is set larger than the angle θ1 between the pair of first portions 35. For this reason, when the lid 50 is welded to the upper surface of the flange portion 25 of the container 20 to form the joining line 30, the position of the lid 50 is shifted with respect to the direction in which the outer edge 25 y of the flange portion 25 extends. Even if it exists, it becomes easy to fit the protrusion line 34 in the range of the protrusion part 26. FIG.

  Next, the widths of the flange portion 25 and the joining line 30 will be described with reference to FIG. Here, the “width” means the dimensions of the flange portion 25 and the joining line 30 in the direction orthogonal to the direction in which the outer edge 25y of the long side 25a of the flange portion 25 extends. In FIG. 4, the symbol W represents the width of the protruding portion 26 of the flange portion 25. Reference sign W <b> 1 represents the width of the region between the inner edge 30 x of the second portion 36 of the protrusion line 34 of the joining line 30 and the inner edge 25 x of the protrusion 26 of the flange portion 25. Reference sign W <b> 2 represents the width of the region between the outer edge 30 y of the second portion 36 of the protruding line 34 of the joining line 30 and the outer edge 25 y of the protruding portion 26 of the flange portion 25. W3 represents the width of the second portion 36 of the protruding line 34 of the joining line 30.

  The width W of the protruding portion 26 of the flange portion 25 is preferably 10 mm or more, for example, in the range of 10 to 15 mm. Further, the width W2 of the region between the outer edge 30y of the second portion 36 and the outer edge 25y of the protruding portion 26 is preferably 5 mm or more, for example, in the range of 5 to 10 mm. By setting the width W and the width W2 in this way, as will be described later, after the vapor hole is formed at the location of the second portion 36 of the protruding line 34, the lid is closed when the pressure in the accommodating portion 28 decreases. 50 can be brought into close contact with the protruding portion 26 of the flange portion 25.

  The width W3 of the second portion 36 of the protruding line 34 is, for example, in the range of 1 to 5 mm. Note that the range of the width W and the width W2 described above may be determined by the ratio of the second portion 36 to the width W3. For example, the width W can be set within a range of 2 to 10 times the width W3. Further, the width W2 can be set to a value larger than the sum of the width W1 and the width W3.

  The second portion 36 of the protruding line 34 is preferably formed so as to be located at the center of the long side 25 a of the flange portion 25. Specifically, an imaginary straight line drawn such that the distance between the outer edge 25y of one short side 25b and the distance between the outer edge 25y of the other short side 25b is equal in plan view, A second portion 36 is formed to pass through the second portion 36. Further, when the protruding lines 34 are respectively disposed on the pair of long sides 25 a of the flange portion 25, it is preferable that the tip of the inner edge 30 x of the second portion 36 of one protruding line 34 and the other protruding line 34. The protruding line 34 is formed so that a center point 20c of the container 20 described later is positioned on a straight line connecting the tip of the inner edge 30x of the second portion 36.

(Manufacturing method of container with lid)
Next, an example of the manufacturing method of the lidded container 10 will be described.

  First, the container 20 having the bottom surface 21, the side surface 23, and the flange portion 25 that are integrally formed is formed by injection molding using a thermoplastic resin such as polypropylene. The thickness T (see FIG. 3) of the flange portion 25 is set within a range of 0.5 to 2.0 mm, for example. In addition, a lid 50 having an outline corresponding to the flange portion 25 of the container 20 is prepared. Next, the container 28 is filled with the contents. Thereafter, the lid 50 is placed on the upper surface of the flange portion 25 of the container 20. Next, a portion of the lid 50 where the joining line 30 is to be formed is heated from the upper surface side using a hot plate or the like to melt the sealant layer of the lid 50. Thereby, the joining line 30 for welding the lid | cover 50 to the upper surface of the flange part 25 of the container 20 can be formed. Thus, the lidded container 10 including the container 20 and the lid 50 joined to the upper surface of the flange portion 25 of the container 20 via the joining line 30 can be obtained. At this time, you may arrange | position the receiving plate which supports the flange part 25 on the lower surface of the flange part 25, without heating the flange part 25. As shown in FIG.

(How to heat contents)
Next, an example of a method for heating the contents accommodated in the accommodating portion 28 of the container 20 of the lidded container 10 will be described.

  First, the lidded container 10 with the bottom surface 21 of the container 20 facing downward is placed inside the microwave oven. Next, the contents are heated using a microwave oven. As a result, the temperature of the contents increases, and accordingly, the moisture contained in the contents evaporates and the pressure in the accommodating portion 28 increases. FIG. 6 shows a state in which a bulging portion 51 that swells above the upper surface of the flange portion 25 is formed on the lid 50 due to an increase in pressure in the housing portion 28. As shown in FIG. 6, the bulging portion 51 is generally formed along the inner edge 25 x of the flange portion 25 around the center point 20 c of the container 20. Here, the “center point 20c of the container 20” is an intermediate point between the outer edge 25y of one long side 25a and the outer edge 25y of the other long side 25a in plan view, and It is a point located at an intermediate point between the outer edge 25y and the other outer edge 25y. In FIG. 6 and FIGS. 7A and 8A described later, the concave portion 21a and the raised portion 21b that can be formed on the bottom surface 21 of the container 20 are omitted.

  When the pressure in the accommodating portion 28 further increases with heating, the bulging portion 51 of the lid 50 further expands and reaches the inner edge 25x of the flange portion 25 as shown in FIG. 7A. Here, in the present embodiment, the protruding line 34 of the joining line 30 is disposed on the long side 25 a of the flange portion 25 of the container 20. Therefore, the bulging part 51 of the lid 50 reaches the second part 36 of the protruding line 34 in the joining line 30 after reaching the inner edge 25x of the flange part 25. When the bulging portion 51 of the lid 50 reaches the second portion 36 of the protruding line 34, the lid 50 is pulled upward with respect to the protruding portion 26 of the flange portion 25 of the container 20 at the place where the second portion 36 is formed. It is done. When the force by which the lid 50 is pulled upward is greater than the joining force of the second portion 36 of the protruding line 34, the second portion 36 is peeled off. As a result, the lid 50 is provided at the place where the second portion 36 is provided. Is peeled off from the protruding portion 26 of the flange portion 25.

  FIG. 7B is a cross-sectional view showing the case with the lidded container 10 shown in FIG. 7A along the line VIIB-VIIB. In the state shown in FIG. 7B, the lid 50 is peeled from the protruding portion 26 of the flange portion 25 at the place where the second portion 36 of the protruding line 34 is provided. In the region between the outer edge 25y of the flange portion 25 and the second portion 36, the lid 50 and the flange portion 25 are not joined. For this reason, a steam hole for discharging the steam inside the accommodating portion 28 to the outside is formed between the lid 50 and the flange portion 25 at the place where the second portion 36 of the protruding line 34 is provided. The Thereby, the pressure of the accommodating part 28 can be reduced. For example, the pressure in the accommodating portion 28 can be matched with an external pressure (usually atmospheric pressure). This makes it possible to heat the contents using a microwave oven while preventing the lid 50 from bursting.

  Moreover, in this Embodiment, the protrusion line 34 of the joining line 30 is arrange | positioned on the long side 25a of the flange part 25 of the container 20 as mentioned above. For this reason, the protruding line 34 can be more reliably separated from the lid 50 or the flange portion 25 before the portion of the joining line 30 other than the protruding line 34. For example, according to the present embodiment, as shown in FIG. 7A, the shortest distance from the center point 20c of the container 20 to the outer edge of the protruding line 34 of the joining line 30 is D1, and the flange portion 25 is formed from the center point 20c of the container 20. When the shortest distance to the inner edge 30x of the main line 32 on the short side 25b is D2, the ratio of the shortest distance D2 to the shortest distance D1 is set to 1.50 or more, preferably 1.80 or more. Yes. For this reason, the distance from the center point 20 c of the container 20 to the joining line 30 is the shortest at the tip of the second portion 36 of the protruding line 34 of the joining line 30. This leads to the inclination angle formed by the bulging portion 51 with respect to the horizontal direction being the largest at the tip of the second portion 36 of the protruding line 34. Accordingly, it is possible to make it easier to peel off the flange portion 25, particularly the second portion 36 of the protruding line 34 on the long side 25 a of the flange portion 25 before the main line 32 on the short side 25 b of the flange portion 25. it can. Therefore, it is possible to stably form the vapor hole at the place where the protruding line 34 is provided. For this reason, the usability of the container 10 with a lid can be improved.

  Moreover, in this Embodiment, the protrusion line 34 of the joining line 30 is each arrange | positioned on a pair of long side 25a of the flange part 25 as mentioned above. For this reason, even if the place where the bulging part 51 of the lid 50 is formed varies in the direction of the short side 25b of the flange part 25, at least one of the protruding lines 34 on the pair of long sides 25a of the flange part 25 is It can be made to peel more reliably. As a result, it is possible to stably form the vapor hole in the place where the protruding line 34 is provided.

  7B, when the second portion 36 of the protruding line 34 is broken, the lid 50 is peeled off from the protruding portion 26 of the flange portion 25 where the second portion 36 of the protruding line 34 is provided. An example is shown, but is not limited to this. Although not shown, the second portion 36 of the protruding line 34 formed on the lid 50 side may be peeled off from the flange portion 25, or the second portion 36 of the protruding line 34 formed on the flange portion 25 side may be the lid. It may peel from 50.

  When the heating of the contents using the microwave oven is completed, the temperature of the steam in the housing portion 28 gradually decreases. For this reason, the pressure of the accommodating part 28 also falls gradually. At this time, the lid 50 may be in close contact with the flange portion 25 at or around the place where the second portion 36 of the protruding line 34 is provided. For example, the lid 50 comes into close contact with the flange portion 25 based on the surface tension of water droplets attached to the lid 50 and the flange portion 25 when the steam passes through the vapor hole formed in the place where the second portion 36 is provided. It is possible. Thus, after the accommodating part 28 is again sealed from the outside, when the temperature of the vapor | steam in the accommodating part 28 falls further, the pressure of the accommodating part 28 will become lower than an external pressure. That is, a negative pressure is generated in the accommodating portion 28. In this case, as shown in FIG. 8A, it is considered that a recessed portion 53 that is recessed below the upper surface of the flange portion 25 is formed in the lid 50. The recessed portion 53 is formed when the lid 50 is recessed with the center point 20c of the container 20 as the center. FIG. 8B is a cross-sectional view showing a case where the lidded container 10 shown in FIG. 8A is viewed along the line VIIIB-VIIIB. The recessed portion 53 works to generate a force that moves the lid 50 downward toward the flange portion 25. For this reason, the lid 50 can be further adhered to the flange portion 25.

  Moreover, in this Embodiment, the protrusion part 26 which protrudes toward inner side is formed in the long side 25a of the flange part 25 as mentioned above. For this reason, the distance from the center point 20 c of the container 20 to the inner edge 25 x of the flange portion 25 is the shortest at the tip of the protruding portion 26 of the flange portion 25. This leads to the inclination angle formed by the recess 53 with respect to the horizontal direction being greatest at the tip of the protrusion 26. Accordingly, the force F that draws the lid 50 downward toward the flange portion 25 at the inner edge 25x of the flange portion 25 is the largest at the tip of the protruding portion 26. That is, the lid 50 is most likely to be in close contact with the upper surface of the flange portion 25 at the tip of the protruding portion 26. Further, the protruding line 34 in which the steam hole is formed is disposed on the protruding portion 26. For this reason, compared with the case where the projecting portion 26 is not formed, the lid 50 is firmly connected to the flange portion in the portion of the joining line 30 where the steam hole is formed, that is, particularly in the second portion 36 of the projecting line 34. 25 can be brought into close contact with the upper surface. Accordingly, it is possible to prevent the contents from spilling from the storage portion 28 after the heating of the contents is completed. For example, even when the lidded container 10 is tilted when the lidded container 10 is taken out from the microwave oven, the contents are spilled when the lid 50 is more firmly attached to the flange portion 25. Can be suppressed.

  For example, the following experiment was performed on the lidded container 10 in which water was contained as the contents, and as a result, the effect of suppressing water spilling was confirmed. Specifically, first, the lid 50 is welded to the flange portion 25 of the container 20 in which water having about half the volume of the container 20 is placed, so that the lidded container 10 containing water is produced. . Next, steam holes were formed between the lid 50 and the flange portion 25 by heating water using a microwave oven. Thereafter, the lid 50 was turned upside down so that the lid 50 was positioned below the container 20 after the lid 50 was in close contact with the flange portion 25 due to a drop in the temperature of the steam. In this state, it was confirmed that water did not spill from the lidded container 10.

  In the present embodiment, as described above, the width W of the protruding portion 26 of the flange portion 25 is in the range of 10 to 15 mm, and the outer edge 30y of the second portion 36 and the outer edge 25y of the protruding portion 26 The width W2 of the area between is in the range of 5 to 10 mm. For this reason, in the place where the 2nd part 36 of the protrusion line 34 is provided, and its periphery, the area | region of the flange part 25 for making the lid | cover 50 closely_contact | adhere and sealing the accommodating part 28 is fully securable. As a result, it is possible to further suppress the contents from spilling from the accommodating portion 28.

  Note that various modifications can be made to the above-described embodiment. Hereinafter, modified examples will be described with reference to the drawings as necessary. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above embodiment are used for the parts that can be configured in the same manner as in the above embodiment. A duplicate description is omitted. In addition, when it is clear that the operational effects obtained in the above-described embodiment can be obtained in the modified example, the description thereof may be omitted.

(Modification of flange part)
In the above-described embodiment, an example in which the protruding portion 26 is formed on the long side 25a of the flange portion 25 of the container 20 and the protruding line 34 of the joining line 30 is disposed on the protruding portion 26 has been described. However, the present invention is not limited to this, and the protrusion 26 may not be formed on the long side 25a of the flange 25 as shown in FIG. Even in this case, the protruding line 34 of the joining line 30 is disposed on the long side 25a of the flange portion 25, and the ratio of the shortest distance D2 to the shortest distance D1 is set to 1.50 or more. The protruding line 34 can be peeled off from the lid 50 or the flange portion 25 before other portions.

DESCRIPTION OF SYMBOLS 10 Container with lid | cover 20 Container 21 Bottom 23 Side 24 Protruding part 25 Flange part 25a Long side 25b Short side 25c Corner part 25x Inner edge 25y Outer edge 26 Outer part 26a First side 26b Second side 28 Housing part 30x Inner edge 30y Outer edge 32 Main Line 34 Projection Line 35 First Part 36 Second Part 50 Lid 51 Swelling Part 52 Contour 53 Recessed Part 54 Contour

Claims (7)

A container in which a housing portion is formed;
A lid joined to the container so as to seal the accommodating portion of the container,
The container includes a bottom surface, a side surface erected from the bottom surface so as to spread around the outer edge of the bottom surface, and a flange portion connected to the upper portion of the side surface and joined to the lid. ,
The outline of the flange portion of the container includes a pair of long sides and a pair of short sides,
Between the lid and the flange portion of the container, a joining line for joining the lid and the flange portion is continuously formed over one circumference,
The joining line includes a main line extending along an outer edge of the flange portion, and a protruding line disposed on the long side of the flange portion and projecting inward from the main line,
The shortest distance from the center point of the container to the outer edge of the protruding line of the joint line is D1, and the shortest distance from the center point of the container to the inner edge of the main line on the short side of the flange portion is D2. Sometimes the lidded container has a ratio of D2 to D1 of 1.50 or more.   The container with a lid according to claim 1, wherein the protruding lines of the joining line are respectively disposed on the pair of long sides of the flange portion. The projecting line of the joining line includes a pair of first portions extending inward from the main line, and a second portion connecting the pair of first portions,
The said 2nd part is a container with a lid | cover of Claim 1 or 2 which has the curved shape which becomes convex toward an inner side. The flange portion has a protruding portion formed on the long side so as to protrude inward,
The container with a lid according to any one of claims 1 to 3, wherein the protruding line of the joining line is disposed on the protruding portion of the flange portion.   The container with a lid according to claim 4, wherein the protruding portions are respectively formed on the pair of long sides of the flange portion.   The container with a lid according to claim 4 or 5, wherein a width of the protruding portion of the flange portion is within a range of 10 to 15 mm.   The container with a lid according to any one of claims 4 to 6, wherein a shortest distance from an outer edge of the protruding portion of the flange portion to an outer edge of the protruding line of the joining line is within a range of 5 to 10 mm. .

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