JP2009067393A - Container for packaging food - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a container for packaging a food which is surely kept sealed without no possibility of the leakage of internal water even if the container is handled beyond an assumption. <P>SOLUTION: In the container 1 composed of a main body 11 and a lid 31, a flexible resin and a rigid resin are used for the main body 11 and the lid 31 as raw materials. A receiving piece 12 with a reverse U-shaped cross-section is annularly formed at the upper part of a side plate 18 of the main body 11, and on the other hand, a covering piece 32 with a reverse U-shaped cross-section is annularly formed at the lid 31. In addition, a water stopping body 19 whose surface is finely projected is annularly formed on the inner peripheral face 20 of the receiving piece 12. It is thereby possible to keep strong sealing properties when the lid 31 is fitted to the main body 11 as the receiving piece 12 is surrounded by the covering piece, and both the receiving piece 12 and the covering piece 32 are brought into facial contact with each other, and the water stopping body 19 strongly presses the covering piece 32. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a food packaging container suitable for storing and selling foods containing a lot of water, such as processed fishery products and pickles.

  Foods containing a lot of water such as processed fishery products and pickles are often shipped in sealed containers. In this case, a bag-like container is widely used, but a relatively expensive food such as sea urchin is often made of resin in consideration of aesthetics. This container is comprised with the main body for accommodating foodstuff, and the lid | cover which block | closes the opening of the main body upper part, and the lid | cover also uses resin equivalent to a main body. And in order to maintain airtightness in the joint part of a main body and a cover, measures, such as sticking an adhesive tape, are taken.

The inventor of the present application has developed the technology such as the following patent document in the past with respect to the sealing property of the resin container. The container based on this document has a very high hermeticity, there is no need to stick an adhesive tape on the mating part of the main body and the lid, and even after opening, it can maintain the same hermeticity as before, Combines convenience and reliability. However, in the distribution and sales stages, severe handling that cannot be assumed in the design stage may occur, and a container that can maintain hermeticity even in such an extreme state is required.
JP 2006-176209 A

  The present invention has been developed on the basis of such a situation, and an object of the present invention is to provide a food packaging container that can reliably maintain hermeticity without leaking moisture inside even when subjected to unexpected handling. .

  The invention according to claim 1 for solving the above-mentioned problem comprises a main body and a lid that covers an opening of the upper portion of the main body, and an inner plate, an outer plate, and a middle plate are formed on the upper portion of the side plate that forms the side surface of the main body. A receiving piece having an inverted U-shaped cross section constituted by a plate is formed in an annular shape, and a cover piece having an inverted U-shaped cross section constituted by an inner plate, an outer plate, and an intermediate plate is annularly formed on the outer edge portion of the lid. The receiving piece of the main body is made of a soft resin, and the covering piece of the lid is made of a resin harder than the receiving piece, and the receiving piece is elastic by pressing of the covering piece to be fitted. The inner plate and the outer plate of the main body are deformed so that the inner plate and the outer plate are in close contact with each other, and the inner plate of the main body is formed with an annular water stop that protrudes toward the inner plate of the facing lid. And

  The food packaging container according to the present invention is composed of a main body that contains food and the like, and a lid that covers the opening at the top of the main body, both of which use a resin that does not greatly deform under normal handling. The body and lid are not the same material, and the lid uses a harder resin. Therefore, it is not assumed that the lid is softer like a lunch box or various storage containers. The comparison between hard and soft is based on the longitudinal elastic modulus. Specific examples of the material include a combination of polypropylene for the main body and styrene for the lid. Moreover, although there is no limitation in the shape of a container, it shall be chamfered with a circular arc etc. so that there may be no corner | angular part seeing from a plane.

  The main body is surrounded by a side plate extending substantially vertically, and a receiving piece having an inverted U-shaped cross section is formed in an annular shape on the upper side of the side plate. The inverted U-shaped receiving piece includes an inner plate that extends substantially vertically from above the side plate, an outer plate that is disposed outside the inner plate, and an intermediate plate that connects the inner plate and the outer plate upward. A certain gap is secured between the inner plate and the outer plate. On the other hand, a cover piece having an inverted U-shaped cross section is also formed in an annular shape at the outer edge of the lid. The inverted U-shaped covering piece is composed of an inner plate extending substantially vertically, an outer plate disposed outside the inner plate, and an intermediate plate that connects the inner plate and the outer plate upward. A certain gap is secured between the inner plate and the outer plate.

  Furthermore, in the present invention, when viewed from the cross section, the outer edge size of the receiving piece needs to be slightly larger than the inner edge size of the covering piece. Thus, when the lid is attached to the main body, the outer edge of the receiving piece is surrounded by the covering piece, and the receiving piece is elastically deformed so that the inner plate and the outer plate are crushed. Therefore, both the inner plate and the outer plate are pressed against each other by a reaction force caused by elastic deformation, and a high degree of sealing performance by surface contact is maintained, and the lid does not naturally come off due to friction. Further, after the lid is fixed, both the middle plates come into surface contact with each other, so that the sealing performance is secured in the entire area of the inner plate, the middle plate, and the outer plate.

  The waterstop is a protrusion formed at one corner of the inner plate of the main body, and this contacts with the outer peripheral surface of the inner plate of the lid, so that a stronger sealing performance is secured. When viewed from the cross-section of the receiving piece, the waterstop has a shape in which only a very narrow area of the inner peripheral surface of the inner plate protrudes into a semicircle or the like, and is formed so as to surround the main body. Further, the position of the waterstop is limited to a range where the main plate and the inner plate of the lid are in surface contact with each other as seen from the cross section. Therefore, the inner plates are in surface contact with each other on both the upper and lower sides of the waterstop. The cross-sectional shape of the waterstop is arbitrary, but a smooth arc shape is optimal.

  When the lid is attached to the main body, the waterstop is pressed by the inner plate of the lid. The main body uses a softer resin than the lid. Therefore, the lid is hardly deformed by the waterstop, but one waterstop is elastically deformed so as to be crushed locally by the lid. Due to the reaction force due to this elastic deformation, the waterstop strongly presses the lid, so that the sealing performance is further improved. It should be noted that the waterstops are not necessarily limited to one line, and a plurality of waterstops may be formed at a certain distance in the vertical direction.

  In the present invention, each inner plate and outer plate may be formed vertically as viewed from the cross section, but only the receiving piece or both the receiving piece and the covering piece extend the inner plate and the outer plate. It may be formed. As a result, the receiving piece and the covering piece are wedge-shaped, so that they are pressed strongly together and an improvement in sealing performance can be expected. Further, since the width of the opening on the lower side of the covering piece is widened, the position adjustment when the lid is attached becomes easy.

  The invention according to claim 2 limits the configuration, and the protruding height of the waterstop is in the range of 0.05 mm to 0.20 mm. The protruding height means the distance to the maximum protruding portion of the waterstop with reference to the inner peripheral surface of the inner plate on the main body side. By limiting the projecting height in this way, the waterstop is elastically deformed by the lid without difficulty, so that it does not become an obstacle when the lid is attached and detached, and the sealing performance is also improved reliably. In addition, the numerical value shown in a claim presupposes the natural state which has not attached the lid | cover.

  The invention according to claim 3 also limits the configuration, and the waterstops are formed in a single row, and the maximum protrusion of the waterstop is the starting point of the upper end of the contact section of both inner plates, and is the total length of the contact section. The distance is from 50% to 70%. In the present invention, the waterstop is limited to one line. Further, the contact section means a section in which the inner plates of both the main body and the lid are in contact with each other in a cross section with the lid attached to the main body, and is a straight line extending substantially vertically. And in this invention, the largest protrusion part of a water stop is located in the distance of 50 to 70% of the full length of a contact area on the basis of the upper end of this contact area. That is, the waterstop is located slightly below the center of the contact section. With this configuration, when the lid is attached, the distance that the waterstop and the lid rub against each other does not become excessive, so the work can be completed with a light force. Since it can be contacted, the sealing property is also good.

  As in the first aspect of the invention, the receiving piece is formed in an annular shape on the upper part of the main body, and the covering piece is also formed in an annular shape on the lid, and the covering piece is closely attached so as to surround the outer edge of the receiving piece. Thus, the receiving piece and the covering piece are brought into strong surface contact to maintain the sealing property. Moreover, since the waterstop formed on the inner plate of the main body is pressed by the inner plate of the lid and is firmly adhered to the lid by the reaction force, the sealing performance at this portion is further improved. For this reason, even if it is handled beyond expectation, the internal moisture does not leak out, and the lid does not loosen due to vibration. Furthermore, since the present invention uses only the elastic deformation of the main body and the lid, the performance does not change even when the lid is opened and closed repeatedly.

  By limiting the protruding height of the waterstop body as in the second aspect of the invention, a sufficient reaction force for the waterstop body to press the lid can be secured, and strong sealing performance is maintained. Moreover, since the waterstop is not excessively large, it does not hinder the surface contact between the main body and the inner plate of the lid, and when the lid is attached or detached, there is no adverse effect such as increased friction, and the waterstop body functions effectively. it can.

  When the lid is attached by limiting the position of the waterstop as in the invention described in claim 3, the distance that the waterstop and the lid rub against each other does not become excessive. Installation of the lid is completed by pushing the lid slightly. In addition, since the main plate and the inner plate of the lid are in surface contact with each other in any region above and below the waterstop, there is no deterioration in sealing performance.

  FIG. 1 shows an outline of the present invention, FIG. 1 (A) is a perspective view showing a schematic shape of a container 1, and FIG. 1 (B) is an AA end view showing a state in which a main body 11 and a lid 31 are separated. FIG. 1C is an AA end view with the lid 31 attached to the main body 11. The container 1 includes a main body 11 that contains food and the like, and a lid 31 that covers the main body 11. The main body 11 has a bottom plate 17 that extends horizontally, and a side plate 18 stands upright so as to surround it. At the upper part of the side plate 18, there are an inner plate 13 and an outer plate 14 aligned in the vertical direction, and an intermediate plate 15 is connected between them, thereby forming a receiving piece 12 having an inverted U-shaped cross section. The receiving piece 12 is formed in an annular shape without a gap at the upper part of the side plate 18 and surrounds the opening of the main body 11.

  One lid 31 has a top plate 37 that extends horizontally to cover the opening of the main body 11, and a covering piece 32 that is paired with the receiving piece 12 is formed on the peripheral edge. The covering piece 32 is also composed of an inner plate 33, an outer plate 34, and an intermediate plate 35, and has an inverted U-shaped cross section and is formed in an annular shape so as to surround the top plate 37. When attaching the lid 31 to the main body 11, the covering piece 32 is brought close to the upper side of the receiving piece 12, the covering piece 32 is placed so as to overlap the receiving piece 12, and both inner plates as shown in FIG. 13 and 33 and the outer plates 14 and 34 are brought into contact with each other to ensure sealing. Of course, the cross-sectional shapes of the receiving piece 12 and the covering piece 32 are not changed everywhere. In order to make the receiving piece 12 and the covering piece 32 function effectively, there are no sharp corners when the main body 11 is viewed from a plane, and the four corners are smoothly connected by arcs having a relatively large radius.

  Both the main body 11 and the lid 31 are integrally formed using a resin that does not plastically deform under normal handling, but the main body 11 uses polypropylene and the lid 31 uses styrene as a material. Therefore, the main body 11 is relatively soft and easily elastically deformed by normal handling, whereas the lid 31 is harder than the main body 11 and cracks occur when it is forcibly deformed. Therefore, when the main body 11 and the lid 31 are brought into contact with each other, the receiving piece 12 is greatly elastically deformed, whereas the elastic deformation of the covering piece 32 is limited.

  As shown in FIG. 1B, the inner plate 13 of the main body 11 faces the inside of the container 1, and when the inner peripheral surface 20 is viewed from a cross section, the waterstop 19 is formed at a substantially intermediate position. Yes. The water sealing body 19 bites into the outer peripheral surface 38 of the inner plate 33 of the lid 31 so that the sealing performance is improved. Although its outer shape is an arc, both ends are smoothly connected to the inner peripheral surface 20 by a small-diameter arc, which is excellent in moldability and does not become an obstacle when the lid 31 is attached or detached. The inner peripheral surface 20 is a simple plane that is slightly inclined from the vertical without any step or curved surface in the section other than the waterstop body 19, and reaches the farthest point of the waterstop body 19 on the basis of this surface. Is defined as the protruding height H.

  When the lid 31 is attached to the main body 11 as shown in FIG. 1C, the outer edge of the receiving piece 12 is covered and the piece 32 surrounds, and the inner plate 13 and the outer plate 14 of the receiving piece 12 are pressed, The lid 31 is fixed by friction caused by the reaction force. At this time, the inner plates 13 and 33 of both the main body 11 and the lid 31, the outer plates 14 and 34, and the intermediate plates 15 and 35 are in surface contact with each other to maintain the sealing performance. The close contact range is defined as a contact section T. In addition, the water stop body 19 exists in the middle of this contact area T, and both the inner plates 13 and 33 are in surface contact with both the upper side and the lower side of the water stop body 19.

  In addition, the band portion 21 is disposed so as to surround the outer plate 14 of the main body 11, and the outer plate 14 and the band portion 21 are connected to each other at the lower side, thereby forming a U-shaped cross section. The outer plate 34 of the lid 31 can be inserted between the part 21. In the vicinity of the center of the inner peripheral surface of the belt portion 21, a concave portion 16 whose surface is scraped off is formed in an annular shape, and a convex portion protruding from the surface is formed on the outer peripheral surface of the outer plate 34 of the lid 31. 36 is formed in an annular shape. Therefore, when the lid 31 is attached to the main body 11, the concave portion 16 and the convex portion 36 are engaged with each other as shown in FIG. 1C, and the main body 11 and the lid 31 are in an unopened state.

  FIG. 2 is a vertical end view showing in detail the principle of joining the main body 11 and the lid 31, and shows only the periphery of the receiving piece 12 and the covering piece 32. In the state of FIG. 2A, the main body 11 and the lid 31 are completely separated, and both are not subjected to external force and maintain a natural shape. The receiving piece 12 has an inverted U-shaped cross section formed by the inner plate 13, the outer plate 14, and the middle plate 15. However, the inner plate 13 and the outer plate 14 are not completely parallel but are divergent. The covering piece 32 also has an inverted U-shaped cross section formed by the inner plate 33, the outer plate 34, and the middle plate 35. The inner plate 33 and the outer plate 34 are not completely parallel but are widened toward the end. With this configuration, there is a difference between the width of the middle plate 15 above the receiving piece 12 and the opening width at the bottom of the covering piece 32, and the lid 31 can be easily attached.

  A waterstop 19 that protrudes in a semicircular shape is formed at substantially the center of the inner peripheral surface 20 of the inner plate 13 of the main body 11. As a result of the trial production so far, the water stopping body 19 is deteriorated in the detachability of the lid 31 when the protruding height H from the inner peripheral surface 20 is in a range of 0.05 mm to 0.20 mm in a natural state. It has been found that the sealing performance is improved. It should be noted that the waterstop 19 in the figure is exaggerated in size, and since it is actually about the above-mentioned numerical value, it is hardly visible.

  When the lid 31 is brought closer to the main body 11, the receiving piece 12 and the covering piece 32 start to contact each other as shown in FIG. Therefore, the inner plate 13 and the outer plate 14 of the receiving piece 12 are elastically deformed so as to be crushed. At this time, since the covering piece 32 receives a reaction force due to the elastic deformation of the receiving piece 12, the covering piece 32 is also elastically deformed so that the opening width of the lower portion is slightly increased. When the lid 31 is further moved, the outer peripheral surface 38 of the inner plate 33 of the covering piece 32 presses the water stop body 19, so that the elastic deformation of the receiving piece 12 further increases. Finally, as shown in FIG. 2C, both the middle plates 15 and 35 come into contact with each other, and the attachment of the lid 31 is completed. At this time, the opening width on the lower side of the receiving piece 12 is narrower from the beginning, and the opening width on the lower side of the covering piece 32 is larger than the original, and the reaction force due to this elastic deformation causes the receiving piece 12 and the covering piece 32 to face each other. Adhere closely to the shape. At the same time, since the convex portion 36 meshes with the concave portion 16, the lid 31 is integrated with the main body 11.

  As shown in FIG. 2C, the waterstop body 19 is completely crushed by the inner plate 33 of the lid 31 in a state where the attachment of the lid 31 is completed. Therefore, the amount of elastic deformation of the waterstop 19 is increased locally, thereby increasing the reaction force acting on the contact surface between the tip of the waterstop 19 and the inner plate 33, and the sealing performance is further improved. In addition, the area | region where both the inner plates 13 and 33 do not contact locally generate | occur | produces on the upper and lower sides of the water stop body 19. FIG. However, this region is limited and does not impair the sealing.

  As shown in FIG. 2C, a range where both the inner plates 13 and 33 are in contact with each other when viewed from the cross section is defined as a contact section T. Although the waterstop 19 is located in the middle of the contact section T, when the cover 31 is attached and detached, if the section where the waterstop 19 and the inner plate 33 rub is long, extra labor is required. Therefore, the water stop body 19 should be provided below in order to shorten the rubbing section, and it is preferable that both the inner plates 13 and 33 can be in surface contact also on the lower side of the water stop body 19. In order to realize this, the position of the waterstop 19 is limited to a position of 50% to 70% of the length of the contact section T with the upper end of the contact section T as a base point. In addition, although the waterstop 19 in the figure is depressed by elastic deformation, it designs so that it may become the said numerical range on the basis of a natural state.

  FIG. 3 shows an example of the opening means of the container 1, FIG. 3 (A) is the middle stage of opening, and FIG. 3 (B) is the main body 11 after opening. As shown in FIG. 2 or the like, the band portion 21 surrounding the outer edge of the main body 11 has a recess 16 formed in the center. Further, a corner 22 of the container 1 has a knob 22 integrated with the band portion 21 as shown in the figure. After pulling out this knob 22 and cutting off the upper half of the band portion 21, the lid 31 can be removed. it can. As shown in FIG. 3B, the water stop body 19 is formed so as to surround the inner peripheral surface 20 of the main body 11.

  4 shows an end face after the upper half of the belt portion 21 is cut off. FIG. 4A shows a state where the lid 31 is attached, and FIG. 4B shows a state where the lid 31 is removed. As shown in FIG. 4A, since the upper half of the band portion 21 is cut off, the lid 31 is fixed only by the receiving piece 12 and the covering piece 32. Even in this state, the entire surface of the receiving piece 12 and the covering piece 32 comes into contact with each other, and sufficient sealing performance is maintained, so that deterioration of the contents can be suppressed. Moreover, the attachment of the lid 31 uses only the elastic deformation of the receiving piece 12 and the covering piece 32, so that the sealing performance is not deteriorated even when opening and closing is repeated.

BRIEF DESCRIPTION OF THE DRAWINGS The outline | summary of this invention is shown, (A) is a perspective view which shows the schematic shape of a container, (B) is an AA end view in the state which isolate | separated the main body and the lid | cover, (C) is a lid | cover with a main body. It is an AA end view of the attached state. It is a longitudinal end view showing in detail the principle of joining the main body and the lid, (A) is a state where the main body and the lid are separated, (B) is in the middle of attaching the lid, (C) is a state after the lid is attached. It is. It is a perspective view which shows the example of the opening means of a container, (A) is the middle stage of opening, (B) is a main body single body after opening. The end surface after cut | disconnecting the upper half of a belt | band | zone part is shown, (A) is the state which attached the lid | cover, (B) is the state which removed the lid | cover.

Explanation of symbols

1 Container 11 Body 12 Receiving Piece 13 Inner Plate (Main Body Side)
14 Outer plate (Body side)
15 Middle plate (main body side)
16 Concave portion 17 Bottom plate 18 Side plate 19 Water stop body 20 Inner peripheral surface 21 Band portion 22 Knob 31 Cover 31 Cover piece 33 Inner plate (lid side)
34 Outer plate (lid side)
35 Middle plate (lid side)
36 Convex part 37 Top plate 38 Outer peripheral surface H Projection height T Contact section

Claims (3)

A main body (11), and a lid (31) that covers the upper opening of the main body (11),
On the upper part of the side plate (18) forming the side surface of the main body (11), a receiving piece (12 having an inverted U-shaped cross section composed of an inner plate (13), an outer plate (14) and an intermediate plate (15) is provided. ) Is formed in an annular shape,
On the outer edge of the lid (31), a cover piece (32) having an inverted U-shaped cross section composed of an inner plate (33), an outer plate (34) and an intermediate plate (35) is formed in an annular shape,
The receiving piece (12) of the main body (11) is made of a soft resin, and the covering piece (32) of the lid (31) is made of a resin harder than the receiving piece (12).
The receiving piece (12) is configured to be elastically deformed by pressing of the covering piece (32) to be fitted, and the inner plates (13, 33) and the outer plates (14, 34) are in close contact with each other,
For food packaging, wherein the inner plate (13) of the main body (11) is formed in a ring shape with a waterstop (19) protruding toward the inner plate (33) of the facing lid (31). container.   The container for food packaging according to claim 1, wherein the protruding height (H) of the waterstop (19) is in the range of 0.05 mm to 0.20 mm. The waterstops (19) are formed in only one row, and the maximum protrusions of the waterstops (19) start from the upper ends of the contact sections (T) of both inner plates (13, 33). The food packaging container according to claim 1, wherein the food packaging container is located at a distance of 50% to 70% of the total length.

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