JP6213544B2 - Container with lid, container and method for producing container - Google Patents

Description

  The present invention relates to a container with a lid provided with a container in which an opening is formed, and a lid joined to the container so as to cover the opening of the container, a container constituting the container with a lid, and a method for manufacturing the same.

  In recent years, a lid that is joined to a container to cover an opening of a container that contains food, chemical products, etc., is configured to be able to stably cover the opening of the container even after the lid is once removed from the container. Have been proposed. For example, Patent Literature 1 discloses a container with a lid that includes a tray and a container having a cover frame configured to be separable from the tray, and a cover foil welded to the upper surface of the tray and the upper surface of the cover frame. . The cover-equipped container is configured such that when the cover foil is removed from the tray, the cover frame is also removed from the tray together with the cover foil. The cover frame is configured to be snapped to the tray. For this reason, the cover foil removed from the tray is put on the tray again, and the cover frame welded to the cover foil is fixed to the tray by snapping, thereby stably covering the opening of the container again. it can.

Special table 2014-502588 gazette

  In the above-mentioned Patent Document 1, when the opening of the container is covered again, the cover frame is fixed to the tray by snapping, but the actual situation is that the resealability is not sufficient.

  The present invention has been made in consideration of such points, and an object thereof is to provide a container with a lid excellent in initial sealing performance and resealability, a container, and a method for manufacturing the container.

The present invention includes a container in which an opening is formed and a lid joined to the container so as to cover the opening of the container, and the container includes a bottom surface, and a side surface erected from the bottom surface. A flange portion continuously provided on an upper portion of the side surface, and the flange portion includes an inner portion continuously provided on the side surface over a circumference, and an outer portion positioned outside the inner portion. Including
The lid is continuously joined to the upper surface of the inner portion over the entire circumference, and at least partially joined to the upper surface of the outer portion, and the upper surface of the inner portion and the outer portion The upper surface is at least partially located on the same plane, the lower surface of the outer portion is positioned below the lower surface of the inner portion, and the outer portion protrudes inward from the outer end of the inner portion. A container with a lid.

  This invention is a container with a lid | cover which the said protrusion part protrudes in the said inner part side only 0.1-1.0 mm from the outer part side edge part of the said inner part.

  The present invention is a container with a lid, wherein the container is made of a thermoplastic resin.

  This invention is a container with a lid | cover which has the reinforcement part in which the said outer part is located below rather than the lower surface of the said inner part.

  The present invention is the container with a lid, wherein the outer portion is located above the upper surface of the outer portion and has a wall portion located outside the lid.

  This invention is a container with a lid | cover in which the joining force between the said lid | cover and the upper surface of the said outer part is larger than the joining force between the said lid | cover and the said inner part.

  This invention is a container with a lid | cover in which the connection part which connects the said inner part and the said outer part is provided between the said inner part and the said outer part.

  The present invention is the lidded container in which the thickness of the connecting portion is smaller than the thickness of the inner portion and the thickness of the outer portion.

  This invention is a container with a lid | cover in which the said connection part is intermittently formed along the said inner part over one round.

  The present invention is the lidded container in which the connecting portion is formed continuously along the inner portion and functions as a hinge portion.

  The present invention relates to a container in which an opening is formed, and the container includes a bottom surface, a side surface standing from the bottom surface, and a flange portion continuously provided on an upper portion of the side surface. Is provided between the inner portion and the outer portion, the inner portion continuously connected to the side surface over the entire circumference, the outer portion positioned outside the inner portion, and the inner portion and the outer portion. A connecting portion connecting the portions, wherein the thickness of the connecting portion is smaller than the thickness of the inner portion and the outer portion, and the upper surface of the outer portion is positioned below the lower surface of the inner portion. And it is the container which provided the protrusion which protrudes in the said outer part side to the said inner part side.

  The present invention relates to a container in which an opening is formed, and the container includes a bottom surface, a side surface standing from the bottom surface, and a flange portion continuously provided on an upper portion of the side surface. Is provided between the inner portion and the outer portion, the inner portion continuously connected to the side surface over the entire circumference, the outer portion positioned outside the inner portion, and the inner portion and the outer portion. A connecting portion connecting the portions, wherein the thickness of the connecting portion is smaller than the thickness of the inner portion and the outer portion, and the upper surface of the outer portion is positioned below the lower surface of the inner portion. In the method for manufacturing a container, the first portion on the upper surface side of the flange portion and the second die on the lower surface side of the flange portion are provided. After facing the first mold A step of injecting a molten resin into the mold of 2, a step of solidifying the resin to mold a container, and a state in which the container is held by the second mold and the first mold and the second mold. This is a method for producing a container comprising a step of separating the mold and a step of releasing the container from the second mold.

  The present invention is a method for manufacturing a container in which the container is released from the second mold by a projecting pin provided in the second mold when the container is released from the second mold.

  ADVANTAGE OF THE INVENTION According to this invention, the container with a lid | cover excellent in initial stage sealing performance and resealability, a container, and the manufacturing method of a container can be provided.

FIG. 1 is an exploded view of members constituting a lidded container in an embodiment of the present invention. FIG. 2 is a perspective view showing a container before a lid is welded. FIG. 3 is a cross-sectional view of a portion including a protrusion of the lidded container. FIG. 4 is a cross-sectional view of a portion including a protrusion of the container before the lid is welded. FIG. 5 is a cross-sectional view of a portion including a connecting portion of a container with a lid. FIG. 6 is an enlarged cross-sectional view of a portion including a connecting portion of the container before the lid is welded. FIG. 7 is a plan view showing the container. 8A, 8B, and 8C are views showing a method for manufacturing a container in the embodiment of the present invention. FIGS. 9A, 9B, and 9C are views showing a method for manufacturing a container in the embodiment of the present invention. FIG. 10 is an enlarged view of FIG. FIG. 11 is a diagram showing an operation in the embodiment of the present invention. FIG. 12 is a view showing a modified example of the lidded container in the embodiment of the present invention. FIG. 13 is a view showing a modification of the lidded container in the embodiment of the present invention. FIG. 14 is a view showing a modification of the lidded container in the embodiment of the present invention. FIG. 15 is a plan view showing a first joint portion and a second joint portion of the inner portion and the outer portion of the flange portion.

<Embodiment of the present invention>
Hereinafter, embodiments of the present invention will be described with reference to FIGS. First, with reference to FIG. 1 and FIG. 2, the whole container 10 with a lid | cover in this Embodiment is demonstrated.

(Container with lid)
FIG. 1 is an exploded view of the members constituting the lidded container 10, and FIG. 2 is a perspective view showing the container 20 before the lid 50 is welded. . The container 10 with a lid includes a container 20 in which an opening 28 is formed, and a lid 50 joined to the container 20 so as to cover the opening 28 of the container 20. 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.

  Further, in this specification, “a container with a lid” means a state where the lid 50 has not been removed yet after the lid 50 is joined to the container 20 unless otherwise specified. In the following description, the container 20 after the lid 50 is removed may be referred to as an opening container 21.

(container)
Next, the container 20 will be described. As shown in FIGS. 1 and 2, the container 20 is connected to the bottom surface 22, a side surface 24 standing from the bottom surface 22 so as to spread around the outer edge 22 e of the bottom surface 22, and an upper portion of the side surface 24. And a flange portion 26. The lid 50 described above is joined to the flange portion 26 of the container 20. FIGS. 1 and 2 show an example in which the flange portion 26 is connected to the upper edge of the side surface 24 and extends in the horizontal direction toward the outside. In this specification, terms such as “side surface”, “upper portion”, “upper edge” and “upper surface”, “lower surface”, and “horizontal direction” described later are used so that the bottom surface 22 of the container 20 is positioned below. The position and direction of the container 10 with a lid | cover, the container 20, the lid | cover 50, and those components are represented on the basis of the state in which the container 10 with a lid | cover and the container 20 are mounted.

  1 and 2 show an example in which the bottom surface 22 and the side surface 24 of the container 20 are configured such that the opening 28 has a quadrangular outline in the horizontal direction. In addition, in this embodiment, the corner | angular part of a quadrangle is chamfered and the corner | angular part is also included in a tetragon | quadrangle including the convex circular arc shape toward the outer side. However, the shape of the container 20 is not particularly limited as long as the desired contents can be accommodated in the container 20. For example, the opening 28 may have a rectangular or polygonal outline in the horizontal direction. Further, the contour of the bottom surface 22 and the contours of the flange portion 26 and the lid 50 may be similar or may not be similar.

  The contents stored in the container 20 are not particularly limited, but examples of the contents include snacks such as nuts, dried fruits, prepared dishes, and sweets. As described later, the lidded container 10 according to the present embodiment is characterized by being excellent in initial sealing performance. Further, as will be described later, the lidded container 10 according to the present embodiment is configured such that the opening 50 of the opening container 21 is utilized using the lid 50 by re-covering the opening container 21 after the lid 50 is removed. 28 can be covered, that is, it is excellent in resealability. “Initial sealability” refers to the gap between the flange portion 26 of the container 20 and the lid 50 in the container 10 with the lid, that is, in a state where the lid 50 has not been removed yet after the lid 50 is joined to the container 20. Means close adhesion.

(Flange part)
Hereinafter, the flange portion 26 of the container 20 will be described in detail with reference to FIGS. 1 to 7. 3 is a cross-sectional view of a portion including a protrusion described later of the container with a lid, FIG. 4 is an enlarged cross-sectional view of a portion including the protrusion of the container before the cover is welded, and FIG. 5 is described later of the container with a lid. Sectional drawing of the part containing a connection part, FIG. 6 is an expanded sectional view of the part containing the connection part of the container before welding a lid | cover.

  FIG. 7 is a plan view showing the container, and FIG. 15 is a plan view showing the container with a lid. Note that FIG. 15 is a diagram in which the portions other than the inner portion 30 and the outer portion 35 of the flange portion 26 are omitted in order to avoid complication.

As shown in FIG. 1 to FIG. 7, the flange portion 26 includes an inner portion 30 continuously connected to the side surface 24 over the entire circumference, an outer portion 35 positioned outside the inner portion 30, and the inner portion 30 and the outer portion. A connecting portion 40 provided between the portion 35 and connecting the inner portion 30 and the outer portion 35 is included. In the present specification, “outside” means a side far from the opening 28 of the container 20 in the horizontal direction. Further, “inner side” means the side closer to the opening 28 of the container 20 in the horizontal direction.
As shown in FIG. 3 to FIG. 5, in the container 10 with a lid according to the present embodiment, when the lid 50 is removed from the container 20 by breaking the connecting portion 40 of the container 20, the outer portion 35 and the container 20 ( It is configured to be removed from the opening container 21). Therefore, in the state of the container 10 with the lid, the lid 50 is at least partially joined to the upper surface 35 a of the outer portion 35.

  As shown in FIG. 7, the connection part 40 is provided in six places intermittently along the inner part 30 over the circumference. In addition, the connection part 40 may be provided continuously along the inner part 30 over one round. The outer portion 35 also extends continuously to the inner portion 30 via the connecting portion 40 over one circumference. And as shown in FIG. 15, the lower surface 50b of the lid | cover 50 is continuously joined to the upper surface 30a of the inner part 30 over one round. By configuring the flange portion 26 and the lid 50 of the container 20 in this manner, the opening portion 28 of the container 20 can be sealed without a gap. That is, initial sealing performance can be expressed.

  As shown in FIG. 1, the flange part 26 has the outer part 35 extended continuously over a round. Joining between the lower surface 50b of the lid 50 and the upper surface 35a of the outer portion 35 as long as the lid 50 can be removed from the container 20 while maintaining the outer portion 35 at least partially joined to the lid 50. The specific state of is not particularly limited. For example, in FIG. 1, the outer portion 35 continuously extends along the inner portion 30 over one round, and the lower surface 50 b of the lid 50 is continuously joined to the upper surface 35 a of the outer portion 35 over one round. Although shown, it is not limited to this. Although not shown, as long as the outer portion 35 can remain at least partially joined to the lid 50 when the lid 50 is removed from the container 20, the outer portion 35 follows the inner portion 30 over a full circumference. And may extend intermittently. In this case, the lower surface 50 b of the lid 50 is continuously joined to the upper surface 30 a of the inner portion 30 over the entire circumference, and at least partially joined to the upper surface 35 a of the outer portion 35. Even in this case, the opening 28 of the container 20 can be sealed without a gap by joining between the lower surface 50 b of the lid 50 and the upper surface 30 a of the inner portion 30. That is, initial sealing performance can be expressed. Further, by joining the lower surface 50b of the lid 50 and the upper surface 35a of the outer portion 35, when the lid 50 is removed from the container 20, the outer portion 35 is maintained at least partially joined to the lid 50. it can.

  In FIG. 15, a first joint portion, which is a portion where the lower surface 50 b of the lid 50 and the upper surface 30 a of the inner portion 30 are joined, is denoted by reference numeral 30 </ b> A. A second joint portion, which is a portion where and are joined, is indicated by reference numeral 35A. In the present embodiment, there is an example in which the first joint portion 30A is formed so as not to reach the inner edge and the outer edge of the inner portion 30, and the second joint portion 35A is formed so as not to reach the inner edge and the outer edge of the outer portion 35. Although not shown, the first joint portion 30A may be formed so as to reach the inner edge or / and the outer edge of the inner portion 30, or the second joint portion 35A may be the inner edge of the outer portion 35 or / And may be formed to reach the outer edge.

  The joint between the lid 50 and the flange portion 26 must be configured so that the lid 50 can be removed from the container 20 while maintaining the outer portion 35 at least partially joined to the lid 50. is there. On the other hand, when the joining force of the second joining part 35A is smaller than the joining force between the other part of the container 20 and the lid 50, for example, the joining force of the first joining part 30A, the lid 50 is removed from the container 20. When a force is applied to the knob portion 26e of the flange portion 26 of the container 20, the lid 50 may be peeled off from the upper surface 35a of the outer portion 35 before the lid 50 is peeled off from the upper surface 30a of the inner portion 30. . Considering this point, the lidded container 10 is preferably configured such that the joining force of the second joining portion 35A is larger than the joining force of the first joining portion 30A. This can prevent the lid 50 from being peeled off from the upper surface 35 a of the outer portion 35 when the lid 50 is removed from the container 20.

  The bonding strength of the first bonding portion 30A and the second bonding portion 35A can be measured using a Tensilon tensile tester (for example, RTC-1310A manufactured by Orientec Co., Ltd.).

  Hereinafter, an example of a procedure for measuring the bonding force will be described.

  First, the sample in which the lid 50 and the flange portion 26 are joined is cut to a width of 15 mm. Next, a part of the lid 50 is peeled off from the flange part 26, and a part of the lid 50 is sandwiched by one of the tensilon gripping jigs, and the flange part 26 is sandwiched by the other gripping jigs. Then, it is pulled at a pulling speed of 300 mm / min so that an angle formed by a part of the lid 50 and the flange portion 26 is 180 °. The maximum value of the load measured when the other part of the lid 50 is peeled from each part of the flange portion 26 is defined as a joining force between the lid 50 and each part of the flange part 26.

  In addition, when the part which the lid | cover 50 and the flange part 26 have not joined is previously contained in a sample, you may abbreviate | omit the operation | work which partially peels the lid | cover 50 and the flange part 26 before measuring a load. .

  When the bonding force is calculated using the above measurement method, the bonding force of the second bonding portion 35A is preferably larger than 20N, more preferably larger than 30N, and the bonding force of the first bonding portion 30A is It is preferably 20N or less, and more preferably 15N or less.

  The specific configuration and method for making the joining force of the second joining portion 35A larger than the joining force of the first joining portion 30A are not particularly limited. For example, it is conceivable to make the area and width of the second joint portion 35A larger than the area and width of the first joint portion 30A. Further, when the lid 50 is joined to the flange portion 26 by welding caused by heating, the temperature at which the lid 50 is welded to the upper surface 35 a of the outer portion 35 is set to the temperature at which the lid 50 is welded to the upper surface 30 a of the inner portion 30. It may be higher than the temperature.

  As described above, the connecting portion 40 is a portion that is broken when the lid 50 is removed from the container 20. By the way, if the strength of the connecting portion 40 is too large, the force applied to the flange portion 26 to break the connecting portion 40 becomes excessively large, and as a result, the portions other than the connecting portion 40 in the container 20 are broken. It may be deformed. Therefore, the connection part 40 is comprised so that it can fracture | rupture with moderate force. For example, as shown in FIG. 6, the inner portion 30, the outer portion 35, and the connecting portion 40 are configured such that the thickness T3 of the connecting portion 40 is smaller than the thickness T1 of the inner portion 30 and the thickness T2 of the outer portion 35. Yes.

  In FIG. 3, in each of the inner portion 30 and the outer portion 35, the upper surfaces 30a, 35a and the lower surfaces 30b, 35b are parallel to each other, so that the thicknesses T1, T2, T3 are constant regardless of the position. It is shown. However, the present invention is not limited to this, and it is conceivable that the thicknesses T1, T2, and T3 change depending on the position. For example, the upper surface 30a, 35a and the lower surface 30b, 35b may be non-parallel. Further, as will be described later, it is also conceivable that the thicknesses T1, T2, and T3 change depending on the position when the outer portion 35 has a protrusion 36, a reinforcing portion 37, and a wall portion 38. In such a case, “the thickness T3 of the connecting portion 40 is smaller than the thickness T1 of the inner portion 30 and the thickness T2 of the outer portion 35” means that “the average value of the thickness T3 is equal to the average value of the thickness T1 and the thickness T2. It may mean "smaller than average value". Alternatively, it may mean that “the maximum value of the thickness T3 is smaller than the maximum value of the thickness T1 and the maximum value of the thickness T2.” Here, the thickness T3 of the connecting portion 40 refers to the thickness along the horizontal direction of the connecting portion 40, and the thickness of the inner portion 30 and the outer portion 40 is the thickness along the vertical direction of the inner portion 30 and the outer portion 35, respectively. Say.

  The connecting portion 40 is easily broken as the thickness T3 decreases. Therefore, considering the ease of opening the lidded container 10, it is preferable that the thickness T3 of the connecting portion 40 is small. On the other hand, when the thickness T3 of the connecting portion 40 becomes too small, an impact applied to the container 20 in the container 20 in a state before the lid 50 is joined or in the process of joining the lid 50 to the container 20 or the like. It is conceivable that the connecting portion 40 breaks due to the above. Considering these points, preferably, the thickness T3 of the connecting portion 40 is set within a range of 0.2 to 0.8 mm. Preferably, the thickness T1 of the inner portion 30 and the thickness T2 of the outer portion 35 are set so that the thickness T3 of the connecting portion 40 is 50% or less of the thickness T1 of the inner portion 30 and the thickness T2 of the outer portion 35. . The thickness T1 of the inner part 30 and the thickness T2 of the outer part 35 are set within a range of 0.5 to 2.0 mm, for example.

  Further, from the viewpoint of easy opening and suppression of unintended breakage, the connecting portion 40 is preferably provided in a region of 0.1% or more and 5.0% or less of the outer periphery of the inner portion 30 of the flange portion 26. More preferably, it is provided in the region of 3% or more and 3.0% or less. As shown in FIG. 7, in the present embodiment, the connecting portion 40 is provided in a region of 0.5% of the outer periphery of the inner portion 30.

  In addition, the width W1 of the inner portion is set in a range of 4 mm or more in order to improve the sealing performance between the container 20 and the lid 50. Further, the width W2 of the outer portion 35 is set so that the lid 50 is not separated from the outer portion 35 when the lid 50 is removed from the container 20 and the lid 50 is joined to the outer portion 35 during the process of joining the lid 50 to the container 20. It is preferably set so that it can be easily positioned on the upper surface 35a. For example, it is preferable to set the width W2 of the outer portion 35 to 3 mm or more. As a result, it is possible to improve the manufacturing suitability when the lid 50 is joined to the outer portion 35 of the flange portion 26, and to make it easier to pick the outer portion 35 when removing the lid 50 from the container 20. For example, the width W3 of the first joint portion 30A is set to 1 mm or more and 2 mm or less. The width W4 of the second joining portion 35A is preferably set to 2 mm or more, preferably 3 mm or more. Further, the width W4 of the second joint portion 35A is preferably at least one time, more preferably at least 1.5 times the width W3 of the first joint portion 30A. Thereby, it is possible to easily ensure the initial sealing performance, and it is possible to make it difficult for the lid 50 to be separated from the outer portion 35 when the lid 50 is removed from the container 20.

  Next, the positions of the inner part 30, the outer part 35, and the connecting part 40 in the vertical direction will be described. In the present embodiment, at least portions of the upper surface 30a of the inner portion 30 and the upper surface 35a of the outer portion 35 that are in contact with the lower surface 50b of the lid 50 are located on the same plane. 3 and 5 show an example in which the entire area of the upper surface 30a of the inner portion 30 and the entire area of the upper surface 35a of the outer portion 35 are located on the same horizontal plane when the lid 50 is welded to the flange portion 26. ing. For this reason, the lower surface 50 b of the lid 50 can be uniformly bonded to the upper surface 30 a of the inner portion 30 and the upper surface 35 a of the outer portion 35. That is, the lid 50 can be stably joined to the flange portion 26 of the container 20. As a result, it is possible to suppress the bonding force between the flange portion 26 of the container 20 and the lid 50 from varying depending on the position and the individual, and the lidded container 10 having excellent initial sealability can be obtained. it can.

  Note that “the upper surface 30a of the inner portion 30 and the upper surface 35a of the outer portion 35 are located on the same plane” means that the end of the upper surface 30a of the inner portion 30 on the connecting portion 40 side in the vertical direction, It means that the difference from the position in the vertical direction of the end on the connecting portion 40 side of the upper surface 35a of the outer portion 35 is 0.5 mm or less, more preferably 0.2 mm or less.

  Preferably, an angle formed between a portion of the upper surface 30a of the inner portion 30 that contacts the lower surface 50b of the lid 50 and a portion of the upper surface 35a of the outer portion 35 that contacts the lower surface 50b of the lid 50 is ± 30 degrees or less. Yes.

  The material constituting the container 20 and the method of manufacturing the container 20 are selected such that the upper surface 35a of the outer portion 35 can be at least partially joined to the lower surface 50b of the lid 50. For example, the bottom surface 22, the side surface 24, and the flange portion 26 may be integrally formed by injection molding using resin. As resin which comprises the container 20, thermoplastic resins, such as a polypropylene, can be used, for example.

  As shown in FIG. 3, the lower surface 35b of the outer portion 35 of the flange portion 26 is located below the lower surface 30b of the inner portion 30, and protrudes inward from the outer end portion 30e of the inner portion 30 to the outer portion 35. A projecting portion 36 is provided. For this reason, the outer part 35 can be firmly fixed to the inner part 30. That is, the resealability of the opening container 21 can be made excellent. A total of four such protrusions 36 are provided at the four corners of the outer portion 35 as viewed from above (see FIG. 7).

  The protrusion 36 preferably protrudes from the outer end 30e of the inner portion 30 to the inner portion 30 side in the range of 0.1 mm to 1.0 mm, and in the range of 0.2 mm to 0.5 mm. More preferably, it protrudes toward the inner portion 30 side. In FIG. 4, the length from the outer end 30 e to the tip of the inner portion of the protrusion 36 is indicated by a symbol L <b> 1. When the length L1 from the outer end 30e to the tip of the inner part of the protrusion 36 is 0.1 mm or less, it becomes difficult to sufficiently exhibit resealability, and when the length L1 is 1.0 mm or more, the outer side It becomes difficult to remove the lid 50 in a state where the portion 35 is joined from the container 20.

  For example, the protrusion 36 can be provided above the lower surface 35 b of the outer portion 35, and can be provided in a region between the lower surface 30 b of the inner portion 30 and the lower surface 35 b of the outer portion 35. When the protrusion 36 approaches or comes into contact with the lower surface 30a of the inner portion 30, the resealability of the opening container 21 can be improved. For example, in FIG. 3, the lower surface 30 b of the inner portion 30 of the flange portion 26 and the protrusion 36 are close to each other, and a gap D <b> 1 is provided between the lower surface 30 b of the inner portion 30 of the flange portion 26 and the protrusion 36. Although the container 10 with a lid is illustrated, the present invention is not limited thereto, and the container 10 with a lid in which the lower surface 36b of the inner portion 30 of the flange portion 26 and the protrusion 36 are in contact with each other may be used. The same can be said for the unsealed container 21 covered with the lid 50 in a state where the outer portion 35 is joined. The gap D1 is preferably 0.5 mm or less. If the gap D1 is 0.5 mm or less, the resealability of the opening container 21 can be improved.

  Further, the protrusion 36 is preferably provided so as to be able to contact an area of 25% or more of the outer periphery of the inner portion 35 of the flange part 26, and provided so as to be able to contact an area of 50% or more. Is more preferable. Thereby, the resealability of the opening container 21 can be improved. Further, the protrusion 36 is preferably provided so as to be able to contact an area of 5% or less of the outer periphery of the inner portion 35 of the flange 26, and provided so as to be able to contact an area of 3% or less. Is more preferable. Thus, the lid 50 with the outer portion 35 joined can be easily removed from the container 20.

  3 and 5 are sectional views of the container 10 with a lid, and FIGS. 4 and 6 are sectional views of the container 20 before the lid is welded.

  As shown in FIGS. 4 and 6, the upper surface 35 a of the outer portion 35 of the flange portion 26 is positioned below the lower surface 30 b of the inner portion 30 in the container 20 before the lid 50 is welded.

  When the lid 50 is welded to the container 20, as shown in FIGS. 4 and 6, the lower surface of the flange portion 26 of the container 20 is held by the retainer 70 and the lid 50 is placed on the flange portion 26 of the container 20. Here, the retainer 70 has the inner portion 30 of the retainer 70 so that the inner portion 30 and the outer portion 35 of the flange portion 26 can be positioned on the same plane when the flange portion 26 and the lid 50 are welded. Is formed so as to protrude more than the portion that contacts the outer portion 35 of the retainer 70. Next, with the retainer 70 holding the lower surface of the flange portion 26 of the container 20, the first hot plate 75 and the second hot plate 76 are lowered with respect to the inner portion 30 and the outer portion 35 of the flange portion 26.

  As a result, the outer portion 35 of the flange portion 26 is raised, and the upper surface 35 a of the outer portion 35 can be positioned on the same plane as the upper surface 30 a of the inner portion 30. In this case, the inner portion 30, the outer portion 35, and the lid 50 are heated and welded between the retainer 70, the first hot plate 75, and the second hot plate. In the above-described example, the example in which the first hot plate 75 and the second hot plate 76 are used has been described. However, heating may be performed using one hot plate.

  During this time, the connecting portions 40 provided at six locations along the same direction between the inner portion 30 and the outer portion 35 remain bent between the inner portion 30 and the outer portion 35. Alternatively, it is conceivable that the connecting portion 40 breaks from the inner portion 30 or the outer portion 35 during the welding operation.

  In this way, the inner portion 30 and the outer portion 35 and the lid 50 are heat-welded between the retainer 70 and the first hot plate and the second hot plate 76 to thereby form a lid comprising the container 20 and the lid 50. The attached container 10 is obtained. As described above, when the connecting portion 40 is broken from the inner portion 30 or the outer portion 35, the container 20 of the lidded container 10 does not include the connecting portion 40.

(lid)
Next, the lid 50 joined to the container 20 will be described. The material making up the lid 50 is selected such that the lower surface 50b of the lid 50 can be joined to the upper surface 30a of the inner portion 30 and the upper surface 35a of the outer portion 35. For example, the lid 50 includes a base material layer and a sealant layer that constitutes the lower surface 50 b 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.

  The above-mentioned “mixed resin of polypropylene and polyethylene” is a material having a relatively small bonding force, which is also referred to as an easy peel sealant. Therefore, when the sealant layer of the lid 50 includes a mixed resin of polypropylene and polyethylene, the lower surface 50b of the lid 50 is securely bonded to the upper surface 35a of the outer portion 35 of the flange portion 26 of the container 20 and the upper surface 30a of the inner portion 30. Can do. Further, when the sealant layer of the lid 50 contains a mixed resin of polypropylene and polyethylene, the bonding force between the lid 50 and the flange portion 26 calculated by the method using the above-described tensile tester is 20 N or less. It is preferable that it is 15N or less.

  On the other hand, when the sealant layer of the lid 50 is made of polypropylene alone, the bonding force is greater than when a mixed resin of polypropylene and polyethylene is used.

(Manufacturing method of container )
Next, a manufacturing method of the container 20 will be described with reference to FIGS. 8 (a), (b), (c) to FIGS. 10 (a), (b). Hereinafter, an example in which the container 20 is manufactured by an injection molding method will be described.

  First, the first die 81 on the upper surface side of the flange portion 26 is opposed to the second die 82 on the lower surface side of the flange portion 26 (see FIG. 8A), and then the first die 81 and the second die The mold 82 is closed and a predetermined cavity space is formed (see FIG. 8B). Next, the molten resin 83 is injected and injected into the cavity space from the gate 81a of the first mold 81, and the container 20 is molded by solidifying between the first mold 81 and the second mold 82. (See FIG. 8 (c)). The resin 83 can be, for example, a thermoplastic resin.

  Next, in a state where the container 20 is held on the second mold 82, the first mold is pulled up and separated from the second mold 82 (see FIG. 9A).

  This state is shown in the enlarged view shown in FIG. As shown in FIG. 10, by separating the first mold 81 from the second mold 82, an area where the flange portion 26 can be deformed upward or laterally is secured.

  That is, the outer portion 35 is provided with a protrusion 36 that protrudes toward the inner portion 30, and this protrusion 36 enters the second mold 82, but the flange portion 26 is placed on the second mold 82. By securing a region that can be deformed upward or laterally, the container 20 having the protrusion 36 on the flange portion 26 can be released from the second die 82.

  Next, as shown in FIG. 9B, the bottom surface 22 of the container 20 is projected by the first pin 82a provided on the second mold 82, and the flange portion 26 is projected by the second pin 82a.

  In this case, since the first mold 81 is separated from the second mold 82 in advance, when the flange 26 is protruded by the second pin 82b, the flange 26 may be deformed upward or laterally. Therefore, the container 20 can be released from the second mold 82.

  Next, as shown in FIG. 9C, the bottom surface 24 of the container 20 is adsorbed by the adsorption mechanism 85, and the container 20 is discharged from the first mold 81 and the second mold 82 to the outside by the adsorption mechanism 85. be able to.

  In the present embodiment, an example in which the first mold 81 and the second mold 82 are arranged in the vertical direction is shown, but the present invention is not limited to this, and the first mold 81 and the second mold 82 include You may arrange | position in the horizontal direction.

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

  First, as described above, the container 20 having the bottom surface 22, the side surface 24, and the flange portion 26 that are integrally formed is formed by injection molding. In this case, the container 20 has a structure before the lid 50 is welded (see FIGS. 4 and 6). Also, a lid 50 having a contour corresponding to the flange portion 26 of the container 20 is prepared. Next, the flange portion 26 of the container 20 is held by the retainer 70 as described above, and the lid 50 is placed on the upper surface 30 a of the inner portion 30. With the retainer 70 holding the flange portion 26 of the container 20, the first hot plate 75 and the second hot plate 76 are lowered with respect to the inner portion 30 and the outer portion 35, respectively. At this time, portions of the lid 50 corresponding to the inner portion 30 and the outer portion 35 of the flange portion 26 of the container 20 are heated from the upper surface 50a side, and the sealant layer of the lid 50 is melted. As a result, the lid 50 can be welded to the upper surface 30 a of the inner portion 30 and the upper surface 35 a of the outer portion 35 of the flange portion 26 of the container 20. At this time, the flange portion 26 may be melted.

  Thus, the lidded container 10 having the container 20 and the lid 50 is obtained. In this case, since the inner portion 30 is welded to the lid 50, the opening 28 of the container 20 can be sealed without a gap. That is, initial sealing performance can be expressed. Furthermore, the upper surface 30a of the inner portion 30 and the upper surface 35a of the outer portion 35 are at least partially located on the same plane. For this reason, it can be set as the container 10 with a lid | cover excellent in initial stage sealing performance.

(How to open a container with a lid)
Next, an example of a method for opening the lidded container 10 will be described.

  First, as indicated by reference numeral Fa in FIG. 1, an upward force is applied to a part of the knob portion 26 e of the flange portion 26 of the container 20 to break the connecting portion 40. At the same time, the lid 50 is peeled from the upper surface 30a of the inner portion 30. Accordingly, as shown in FIG. 11, the lid 50 in a state where the outer portion 35 is joined can be removed from the container 20, and the container 20 can be used as the opening container 21. In addition, when the connection part 40 is fractured | ruptured when manufacturing the container 10 with a lid | cover, the operation | work which fractures | ruptures the connection part 40 is abbreviate | omitted.

  In the present embodiment, as described above, the lid 50 with the outer portion 35 joined is removed from the container 20. Then, the opening part 28 of the opening container 21 can be covered again using the lid | cover 50 in the state to which the outer side part 35 was joined. For example, the opening container 21 can be resealed by covering the container 20 so that the outer part 35 joined to the cover 50 is located outside the inner part 30 of the opening container 21 (FIG. 3). reference). At this time, since the protrusion 36 of the outer portion 35 of the flange portion 26 protrudes inward from the outer end portion 30 e of the inner portion 30, the outer portion 35 can be firmly fixed to the inner portion 30. That is, the resealability of the opening container 21 can be made excellent.

  In the present embodiment, since the lid 50 with the outer portion 35 joined is removed from the container 20, the lid 50 is deformed as compared with the case where the lid 50 is detached from the container 20 alone. For example, the lid 50 can be prevented from being bent or curled. Therefore, when the opening container 21 is resealed using the lid 50, the flatness of the lid 50 can be maintained more stably.

  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 outer part)
Next, a modified example of the present invention will be described. As shown in FIG. 12, the outer portion 35 may have a wall portion 38 that is located above the upper surface 35 a of the outer portion 35 and located outside the lid 50. By providing such a wall portion 38 and enclosing the lid 50 of the lidded container 10 from the outside, the lid 50 of the lidded container 10 is peeled off from the outer portion 35 of the flange portion 26 of the container 20 by intention or error. This can be suppressed. In addition, the rigidity of the outer portion 35 can be increased by providing the wall portion 38. Thereby, it can further suppress that lid 50 after removing from container 20 curves or curls. Moreover, when breaking the connection part 40 in order to open the container 10 with a lid | cover, the part in which the wall part 38 is provided among the outer parts 35 can be made easy to pick. For this reason, the openability of the container 10 with a lid can be improved.

(Modification of outer part)
As shown in FIG. 13, the outer portion 35 may be provided with a reinforcing portion 37 extending downward. By providing the reinforcing portion 37, the rigidity of the outer portion 35 can be increased. Thereby, it can further suppress that lid 50 after removing from container 20 curves or curls. In this modification, an example in which the reinforcing portion 37 extends along the inner end portion 35e of the outer portion 35 is shown. In this case, when the lid 50 is put on the opening container 21, the end portion on the inner portion 30 side of the reinforcing portion 37 abuts on the outer end portion 30 e of the inner portion 30, so that the inclined surface 35 c causes the lid 50 to move downward. Can act as a guiding guide. For this reason, the resealing operation can be facilitated. In order to make the reinforcing portion 37 function effectively as a guide, the length L of the reinforcing portion 37 is preferably 2 mm or more. Moreover, you may provide the inclined surface 35c which inclines below in the edge part 37e inside the reinforcement part 37 as it goes outside. This can further facilitate the resealing operation.

  In addition, although some modified examples with respect to the above-described embodiment have been described, naturally, a plurality of modified examples can be applied in combination as appropriate.

  Furthermore, in the above-described embodiment, the example in which the connecting portions 40 are intermittently provided at the six locations along the inner portion 30 has been shown. However, the present invention is not limited to this, and the connecting portions 40 are connected as shown in FIGS. The portions 40 may be provided intermittently at four locations along the inner portion 30, and the protrusions 36 of the outer portion 35 may be provided at the corners of the four corners of the outer portion 35. Further, as shown in FIGS. 14A and 14B, between the inner portion 30 and the outer portion 35, on one side edge of the flange portion 26 in a plan view, facing the knob portion 26 e in this modification. A continuous additional connecting portion 40A is provided in a region sandwiched between the protrusion 36 and the protrusion 36.

  The additional connecting portion 40A to be connected is provided on one side edge of the flange portion 26. When the lid 50 is removed from the container 20 with the knob 26e, the additional connecting portion 40A is not cut and opens and closes the lid 50 when resealed. In some cases, it functions as a hinge. In this case, the length L2 of the connecting portion 40A can be 5 mm or more.

DESCRIPTION OF SYMBOLS 10 Container with lid 20 Container 21 Opening container 22 Bottom surface 24 Side surface 26 Flange portion 30 Inner portion 30a Upper surface 30b Lower surface 30c Inclined surface 30A First joint portion 35 Outer portion 35a Upper surface 35b Lower surface 35c Inclined surface 35A Second joint portion 36 Projection portion 37 Reinforcement part 38 Wall part 40 Connection part 50 Lid

Claims (19)

A container having an opening formed therein,
The bottom,
A side surface erected from the bottom surface;
A flange portion provided continuously to the upper portion of the side surface,
The flange portion is provided between an inner portion continuously connected to the side surface over the entire circumference, an outer portion located outside the inner portion, and the inner portion and the outer portion, And a connecting portion connecting the outer portion,
The upper surface of the inner portion and the upper surface of the outer portion are parallel to each other;
The upper surface of the outer portion is located below the lower surface of the inner portion,
The container which provided the protrusion which protrudes in the said inner part side in the side surface located between the upper surface and lower surface of the said outer part parallel to the upper surface of the said inner part. A container having an opening formed therein,
The bottom,
A side surface erected from the bottom surface;
A flange portion provided continuously to the upper portion of the side surface,
The flange portion is provided between an inner portion continuously connected to the side surface over the entire circumference, an outer portion located outside the inner portion, and the inner portion and the outer portion, And a connecting portion connecting the outer portion,
The connecting portion is intermittently formed along the inner portion,
The upper surface of the outer portion is located below the lower surface of the inner portion,
The container which provided the protrusion which protrudes in the said inner part side in the side surface located between the upper surface and lower surface of the said outer part. A container having an opening formed therein,
The bottom,
A side surface erected from the bottom surface;
A flange portion provided continuously to the upper portion of the side surface,
The flange portion is provided between an inner portion continuously connected to the side surface over the entire circumference, an outer portion located outside the inner portion, and the inner portion and the outer portion, And a connecting portion connecting the outer portion,
The connecting portion is continuously formed along the inner portion and functions as a hinge portion.
The upper surface of the outer portion is located below the lower surface of the inner portion,
The container which provided the protrusion which protrudes in the said inner part side in the side surface located between the upper surface and lower surface of the said outer part. The connecting portion along said inner portion is intermittently formed container according to any one of claims 1 or 3. Said connecting portion, said continuously formed to function as a hinge portion along the inner portion, the container according to claim 1 or 2. The protrusion protrudes into the only 0.1mm~1.0mm than the outer portion end inner portion side of the inner portion, the container according to any one of claims 1 to 5. The container has a thermoplastic resin container according to any one of claims 1 to 6. The container according to any one of claims 1 to 7 , wherein the outer portion has a reinforcing portion positioned below the lower surface of the inner portion. It said outer portion is a portion including a top surface parallel to the upper surface of the inner portion, as well as positioned above the upper surface of the portion, having a wall portion located on an outer side than the portion, to claim 1 The container according to any one of 8 . The container according to any one of claims 1 to 9 , wherein a thickness of the connecting portion is smaller than a thickness of the inner portion and a thickness of the outer portion. A container having an opening formed therein;
A lid joined to the container so as to cover the opening of the container,
The container has a bottom surface, a side surface erected from the bottom surface, and a flange portion continuously provided on an upper portion of the side surface,
The flange portion includes an inner portion that is continuously connected to the side surface over a circumference, and an outer portion that is located outside the inner portion,
The lid is continuously joined to the upper surface of the inner portion over the entire circumference, and at least partially joined to the upper surface of the outer portion;
The upper surface of the inner portion and the upper surface of the outer portion are at least partially coplanar, and the lower surface of the outer portion is positioned below the lower surface of the inner portion;
A container with a lid, wherein a protrusion projecting inward from an outer end of the inner portion is provided on the outer portion. The container with a lid according to claim 11 , wherein a bonding force between the lid and the upper surface of the outer portion is larger than a bonding force between the lid and the inner portion. The container with a lid according to claim 11, wherein a connecting portion that connects the inner portion and the outer portion is provided between the inner portion and the outer portion. The container with a lid according to claim 13, wherein a thickness of the connecting portion is smaller than a thickness of the inner portion and a thickness of the outer portion. The said connection part is a container with a lid | cover in any one of Claim 13 or 14 currently formed along the said inner part intermittently. The said connection part is a container with a lid | cover in any one of Claims 13 thru | or 15 formed continuously along the said inner part, and functioning as a hinge part. Preparing the container according to any one of claims 1, 2 or 3, and
Placing a lid on the top surface of the inner portion of the container;
While holding the lower surface of the outer portion of the container, the upper surface of the inner portion is pressed downward by a hot plate through the lid, whereby the upper surface of the outer portion and the upper surface of the inner portion are the same. And a step of welding the lid to the upper surface of the inner portion and the upper surface of the outer portion. In the container in which the opening is formed, the container includes a bottom surface, a side surface erected from the bottom surface, and a flange portion continuously provided on an upper portion of the side surface, and the flange portion extends over the entire circumference. An inner part continuously connected to the side surface, an outer part located outside the inner part, and provided between the inner part and the outer part, and connects the inner part and the outer part. A thickness of the connecting portion is smaller than a thickness of the inner portion and a thickness of the outer portion, and an upper surface of the outer portion is located below a lower surface of the inner portion, and the outer portion In the method of manufacturing a container, provided with a protrusion protruding to the inner portion side in the part,
After the first mold on the upper surface side of the flange portion and the second mold on the lower surface side of the flange portion are opposed to each other , molten resin is injected into the space between the first mold and the second mold. Process,
A step of solidifying the resin and molding a container;
A step of interrogating the first mold and the second mold in a state where the container is held by the second mold;
And a step of releasing the container from the second mold. When releasing the container from the second mold,
The container manufacturing method according to claim 18, wherein the container is released from the second mold by a protruding pin provided in the second mold.

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