JP2009062073A - Sealed container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging container capable of ensuring high sealability even if the sealed container is made of flexible, soft polypropylene which can be used for frozen storage and also microwave cooking. <P>SOLUTION: A sealed container fitted inside and outside includes a container body B which has a fitting projection B1 circumferentially formed around an opening, and a lid C which has a fitting recess C1 circumferentially formed so as to correspond to the fitting projection B1. In the sealed container, a horizontal linear groove B12 is circumferentially formed in the outer surface of the outer wall B11 of the fitting projection B1. In addition, an inward horizontal linear projection C12 is circumferentially formed in the inner surface of the outer wall C11 of the fitting recess C1. Thus, when the lid C is fitted to the container main body B, the linear projection C12 fits into the linear groove B12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  Both the present invention consists of a container body and a lid made of synthetic resin, and is sealed by fitting the edge of the lid to the opening edge of the container body, preventing invasion of germs into the food contained therein. In addition, the present invention relates to an improvement in a packaging container that can prevent external leakage of liquid accompanying food or the like.

  In the distribution and sale of processed foods, transparent synthetic resin packaging containers are often used so that the contents can be visually recognized from the outside. The most widely used is to provide a fitting part that forms a downward concave line with a U-shaped cross-section at the edge of the lid, while forming a similar upward convex line at the opening edge of the container body. This is a so-called inside / outside fitting type packaging container in which fitting parts are provided and a lid is fitted to the container body by both fitting parts. In this type of container, even a thin sheet molded product has a large contact area at the peripheral edge where the lid and the container main body are fitted, so that it is relatively difficult to leak.

  However, due to the design / molding accuracy of the container, deformation after molding, etc., the desired adhesion to the mating part cannot be obtained, or due to deformation during transportation, a gap is created in the mating part (sealing performance)・ Watertightness) was impaired, and liquid dishes such as sugar beet and soup were often leaked. Therefore, conventionally, various sealed containers have been proposed.

  For example, in the sealed container previously proposed by the present applicant (Patent Document 1), the container body and the lid are both formed using a polyester resin, and at least the mouth side of the fitting edge is bent in a substantially S shape. By forming the ceiling part between the mouth edge side and the outer edge side round, the fitting edge part on the container body side easily slips into the fitting edge part on the lid side when the lid is fitted, while both fitting parts It forms so that the adhesiveness in may be improved. That is, both the lid and the fitting edge of the container main body have a substantially Ω-shaped cross section and are brought into close contact with each other over the entire circumference. As a result, high sealing performance is ensured.

  In addition, a plurality of rows of fitting grooves are provided on the peripheral wall surface of the fitting portion of the container body, and a plurality of rows of fitting protrusions are provided on the peripheral wall surface of the fitting portion of the lid. There has also been proposed a container with a lid that attempts to realize a sealed state by fitting convex protrusions (Patent Document 2).

Japanese Unexamined Patent Publication No. 2000-177764 JP 2006-117296 A

  However, the hermetic container according to Patent Document 1 has a particularly high fitting portion when using a material that is stiff and sticky as a characteristic of the resin itself, such as polyester (PE) or polyethylene terephthalate (PET). Thus, it was possible to enhance the sealing performance by increasing the contact width between the container main body and the lid, but when the container was made of a soft polypropylene (PP), the desired sealing performance was not obtained. It is thought that the cause is that a gap is easily generated in the fitting portion between the container main body and the lid in the case where polypropylene is weak.

  Further, in the container with a lid according to Patent Document 2, the outer peripheral wall of the container main body and the cover peripheral wall of the lid are only slightly overlapped, and are substantially a so-called inner / inner fitting type, and a plurality of rows Since it is trying to realize a sealed state only by fitting the fitting groove and the fitting ridge, the container itself will be deformed during transportation etc. if it is made of a weak resin product such as polypropylene For this reason, there is a drawback that a gap is easily generated in the fitting portion, and as a result, liquid leakage from the contents tends to occur.

  Here, when the container is made of polypropylene, it is resistant to temperature changes, and it is possible to thaw and heat the processed food that has been stored frozen in a microwave oven, so as a packaging container for prepared dishes such as curry It will be optimal. However, an object of the present invention is to provide a packaging container that can ensure high sealing performance even when it is made of soft and weak polypropylene.

  In order to solve the desired problem, in the sealed container according to the present invention, a container main body provided with a fitting protrusion around the opening, and a downward fitting groove corresponding to the fitting protrusion. As an inner / outer fitting type consisting of a cover provided around the periphery, a horizontal linear groove is provided on the outer surface of the outer wall of the fitting protrusion, and an inward horizontal linear protrusion is provided around the inner surface of the outer surface of the fitting groove. It was formed so that when the lid was fitted to the container body, the line projections were fitted into the line grooves.

  The fitting portion formed by the fitting protrusion on the container main body and the fitting groove on the lid is made to have a substantially Ω-shaped cross section so as to be in close contact with the entire circumference, like the container disclosed in Patent Document 1. Good. That is, (1) a shape in which the base side of each inner wall bulges slightly outward (that is, the top side of each inner wall bulges slightly inward) so that the cross-sectional shape of the inner fitting portion is substantially S-shaped, (2) The ceiling (head) is rounded so as to form a dome-shaped cross section, and (3) a wide brim is formed on the outer periphery of the outer edge, so that the adhesion is inherently improved. Furthermore, the gap between the lid and the container and the generation of a gap are prevented by fitting the linear groove on the container body side and the linear protrusion on the lid side. Especially when it is made of low-waist polypropylene, the outer fitting part is more than the peripheral groove and line projection around the inner fitting part because the pressing force on the lid side in the inner fitting part is weak. It was more effective to provide a line groove and a line protrusion around the wire.

  Further, the depth of the linear groove in the container body is made larger than the height of the linear protrusion in the lid so that a gap (space) is secured between the linear groove and the linear protrusion when the lid is fitted to the container body. It is good to. The gap between the two is formed as a space around the entire circumference of the container like a tunnel, but the moisture that has slightly overcome the fitting ridge due to deformation during transportation etc. is caused by the surface tension of the tunnel. It remains in the space and is prevented from leaking out of the container.

  When both the container main body and the lid are molded using a polypropylene sheet material, the container main body is vacuum-formed while the lid is pressure-molded. Vacuum forming is not only suitable for deep objects, but also has the feature of improving the reproducibility of the groove shape, while compressed air forming has the feature of not only ensuring high transparency but also a gentle groove shape. There is an advantage that a gap between the wire projections can be easily secured.

  In the sealed container according to the present invention, since the fitting is performed by the linear groove on the container body side and the linear protrusion on the lid side in the outer fitting portion of the inner / outer fitting method, for example, the increase in the air pressure enclosed in the container Thus, even if the lid is lifted, the fitted state can be maintained, so that high sealing performance can be ensured.

  In particular, if the tunnel space is ensured over the entire circumference of the container between the line grooves and the line protrusions, the moisture that has passed over the tightly fitting part of the inner fitting part and the fitting protrusions will enter the tunnel space. However, leakage to the outside of the container is prevented.

  Hereinafter, the sealed container according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal end view showing an example of a sealed container according to the present invention, in which (A) shows a lid C and (B) shows a container body B, respectively. FIG. 2 is an enlarged view of the fitting portion at the upper left edge in FIG. 1, where (A) shows the lid C and (B) shows the container body B, respectively. FIG. 3 is a partially enlarged end view of the fitting portion showing a state where the lid C is fitted to the container body B. FIG. The sealed containers of the examples shown in the drawings are circular in plan view, and are assumed to be generally cylindrical when closed, but the present invention is applicable to various containers such as a square in plan view and a polygon in plan view. Needless to say, you can. However, in the case of a circular shape in plan view, there is an advantage that the liquid pressure is less likely to leak because the internal pressure acts uniformly on the fitting portion.

  As shown in FIG. 1, in the sealed container according to the present invention, the fitting protrusion B1 is provided around the entire opening of the upper surface side of the container body B, while the downward fitting corresponding to the fitting protrusion B1 is provided. It is comprised from the cover C which provided the recessed groove C1 in the whole periphery. On the outer surface of the outer wall B11 of the fitting protrusion B1 of the container body B, a linear groove B12 extending in the horizontal direction is provided over the entire circumference (see FIG. 2 (B)). The cross-sectional shape of the linear groove B12 is not limited to a semicircular shape as shown in the drawing, but it is desirable that the linear groove B12 has a smooth curved shape so that it can be easily pulled out in relation to the molding die.

  On the other hand, on the inner surface of the outer wall C11 in the fitting recess C1 of the lid C, a linear protrusion C12 that protrudes inward is provided over the entire circumference in the horizontal direction. The cross-sectional shape of the line protrusion C12 is not limited to the semicircular shape as shown in the figure, but is slightly smaller to fit in the line groove B12, in other words, the depth of the line groove B12. When the lid C is fitted to the container body B, a gap (space) is secured between the linear groove B12 and the linear protrusion C12. .

  That is, as shown in FIG. 3, when the lid C is fitted to the container main body B, the inner wall B13 of the container main body B in the inner fitting portion is in close contact with the inner wall C13 of the lid C, and at the top of the head. The ceiling part B14 of the container main body B and the ceiling part C14 of the lid C are both rounded so as to form a dome-shaped cross section, but are spaced apart to ensure a gap S1, and the outer wall of the container main body B at the outer fitting part Although B11 and the outer wall C11 of the lid C are in close contact with each other, a gap S2 is secured between the linear groove B12 of the container body B and the linear projection C12 of the lid C. Subsequently, the outer wall B11 and the outer wall C11 Are formed so as to reach the wide brim portions B15 and C15. In the drawing, the flanges B15 and C15 are drawn so as to be separated from each other, but in actuality, the flanges B15 and C15 serving as the separation end portions are almost in close contact with each other.

  In order to bring the outer wall B11 of the container body B and the outer wall C11 of the lid C into close contact with each other as much as possible, the fitting protrusion B1 in the container body B and the fitting groove C1 in the lid C are both base parts. Preferably, the inner width X on the top side is wider than the inner width Y on the side. In order to close the lid, the top of the fitting protrusion B1 in the container body B is inserted from the base of the fitting groove C1 in the lid C. If it is done, there is an advantage that it is difficult to drop off and the degree of adhesion increases.

It is the vertical end view which showed an example of the sealed container which concerns on this invention, (A) is a lid | cover and (B) has shown the container main body. It is the figure which expanded the fitting part of the upper left edge in FIG. 1 partially, (A) is a lid | cover and (B) has shown the container main body. It is a partial expanded end view of the fitting part which shows the state which fitted the lid | cover to the container main body.

Explanation of symbols

B Container body B1 Mating protrusion B11 Outer wall B12 Linear groove B13 Inner wall B14 Ceiling part B15 Hook part C Lid C1 Mating groove C11 Outer wall C12 Linear protrusion C13 Inner wall C14 Ceiling part C15 Hook part

Claims (3)

An inner / outer fitting type sealed container comprising a container main body provided with a fitting protrusion around the opening, and a lid provided with a downward fitting groove corresponding to the fitting protrusion, When a horizontal linear groove is provided on the outer wall outer surface of the fitting protrusion and a horizontal line protrusion is provided inward on the outer wall inner surface of the fitting groove, and the lid is fitted to the container body. A hermetically sealed container formed so that the line protrusions fit into the line grooves. 2. The sealed container according to claim 1, wherein the depth of the linear groove is greater than the height of the linear protrusion, and a gap is secured between the linear groove and the linear protrusion when the lid is fitted to the container body. . 3. The sealed container according to claim 2, wherein both the container main body and the lid are formed using a polypropylene sheet material, the container main body is vacuum-formed, and the lid is pressure-formed.

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