JPH07165263A - Sealing structure of container for storing rice-cake offering - Google Patents

Abstract

PURPOSE:To provide a sealing structure for preventing the deformation of the thinnest wall, i.e., a weak point, of a container for storing the rice-cake offering. CONSTITUTION:A seal cover B is for sealing a rice cake pouring opening 14 formed in the bottom of a storing container A blow molded from a thermoplastic synthetic resin and is made into a combined paper body comprising a rear sheet 21 consisting of the thermoplastic synthetic resin being the same as that of the container A itself and a surface sheet 20 consisting of the thermoplastic synthetic resin having a higher heat resistance than that of the rear sheet 21. The overall thickness of the combined paper body is made even smaller than the thinnest wall of the container A itself. The seal cover B is integrally fused to the bottom surface of the container A with the rear sheet 21 in contact with the container A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing structure for a filling container for offering rice cakes.

[0002]

2. Description of the Related Art A transparent or semi-transparent thermoplastic synthetic resin is blown into a filling container in which an upper stage small container and a lower stage large container are concentric circles in plan view and are blow-molded in a communicating state inside. All rice cakes are poured and sealed, then heat sterilized and cooled to solidify, and then sold as kagami rice cakes or other offering rice cakes packed in the container.
Regarding such a filling container for offering rice cakes, the present inventor has already proposed Japanese Patent Publication No. 59-35579 and Japanese Utility Model Publication No. 58-11.
No. 6573, No. 62-13495, No. 63-63
No. 23342, Jikken 1-20302, etc. were proposed.

In these known means, when sealing the rice cake pouring opening formed on the bottom surface of the filling container, a sealing cover (sealing piece) thinner than the container itself is used in each case. This is welded (heat-sealed) to the bottom surface of the filling container by a hot platen or the like.

Regarding the purpose of adopting the thin seal cover, as described in Japanese Utility Model Publication 1-20302, when the seal cover is thicker than the container itself, it is poured into the container. When the volume of the rice cake shrinks due to subsequent cooling action, or when the air enclosed in the rice cake and its container expands due to the subsequent sterilization boil action, the shrinkage and expansion are sealed. Cannot be reliably absorbed and compensated by the container, and the thin-walled part of the container itself becomes a weak point, so that the container partially collapses or expands, creating an appearance that is important as a commercial value for this kind of rice cake. This is to prevent this as it will result in inhibition.

[0005]

However, as described above, the structure in which the thickness of the seal cover is simply made thinner than that of the filling container itself has the following problems.

That is, even if the seal cover is provisionally thinned, since the container is relatively thicker than the seal cover, in order to instantaneously weld and integrate both of them, it is necessary to melt the container itself. It is necessary to pressurize with a hot plate having a sufficiently high temperature, which causes shrinkage and deformation of the thin seal cover due to overheating, and when printed characters or the like are printed on the seal cover, the printed image line is destroyed.

[0007] As a countermeasure, the above-mentioned Japanese Utility Model Publication No. 62-13
As described in No. 495, "patch cloth" that can withstand the temperature of the hot platen, etc. must be laid and pressure must be applied from above, which is extremely complicated in terms of work and maximizes the effect of mass production. I can't.

[0008] In this respect, the Japanese Utility Model Publication No. 62-13495 also states, "In addition, the seal piece is shown in FIG. 7 so that it can be easily heat-sealed to the bottom surface of a plastic-made container (a) such as a plastic. The fused surface is polypropylene (e ') as shown
However, it is better to form the outer surface with two layers so as to make it a vinyl box (e ''). "

However, in the case of the two layers, polypropylene, which comes into direct contact with the bottom surface of the container, has a higher heat resistance (melting temperature) than the vinyl chloride forming the outer surface, and the vinyl chloride has the above-mentioned contact. Since it cannot function as a cloth, it still causes the above-mentioned problems.

[0010]

DISCLOSURE OF THE INVENTION The present invention intends to improve such a problem, and seals a rice cake pouring opening formed on the bottom surface of a filling container which is molded from a thermoplastic synthetic resin because of its constitution. For the seal cover, a backing sheet made of the same thermoplastic synthetic resin as the container itself and a front sheet made of a thermoplastic synthetic resin having higher heat resistance than the backing sheet, and The overall thickness of the container is thinner than the thinnest part of the container itself, and the seal cover is welded and integrated to the bottom surface of the container under the condition that the back sheet contacts the container. It is characterized by that.

[0011]

According to the above-mentioned structure of the present invention, the seal cover for sealing the rice cake pouring opening of the filling container is made of the interleaf sheet of the front sheet and the back sheet, and the overall wall thickness of the container itself. Since it is thinner than the thinnest part, after sealing the container with the seal cover, the rice sterilization boil action causes the enclosed air to expand together with the rice cake, and also the cooling action. Even if the rice cake shrinks upon receipt, it can be reliably absorbed and compensated for by the seal cover, it does not spread to the thinnest weak point of the container itself, preventing unauthorized deformation from that weak point You can do it.

Moreover, since the back sheet of the seal cover comes into direct contact with the bottom surface of the container and is made of the same thermoplastic synthetic resin as that of the container itself, a continuous integrated and stable welded state with high affinity can be obtained. The durability and sealing effect of rice cake can be greatly enhanced.

On the other hand, since the front sheet of the seal cover is made of a thermoplastic synthetic resin having a higher heat resistance (melting temperature) than the back sheet, the so-called back sheet has a heating temperature as high as it can withstand as a patch. In addition, it can act on the container itself, and the back sheet and the container can be instantly welded and integrated with each other, and the display image line that may be printed on the front sheet nevertheless collapses due to overheating. There is no fear, and the printed image has excellent abrasion resistance.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete constitution of the present invention will be described below in detail with reference to the drawings. FIGS. 1 to 3 show a basic embodiment of a filling container (A) for offering rice cake, which communicates with the inside. In the stacked state of the upper small container (11) and the lower large container (12), the large and small containers (12) (11) form an overall concentric circle in a plan view.

Moreover, when viewed from the side, each of the large and small containers (12) and (11) has a substantially elliptical shape extending in a slender shape along the horizontal direction, and the top surface of the upper small container (11). Is the one having the highest convex curved surface in the central part integrally blow molded from transparent or opalescent semitransparent polyethylene, polypropylene, or other thermoplastic synthetic resin.

(13) is the large and small containers (12) and (11)
It is a concave peripheral groove portion that is depressed at the boundary position of, and is smoothly continuous with the large and small containers (12) and (11) while drawing a small arc surface. In this respect, in the illustrated embodiment, the concave circumferential groove portion (13) is divided into bisectors (O-) of the entire height (h) in the filling container (A).
By eccentrically arranging it to an upper position by a certain constant distance from O), the entire filling container (A) has a realistic contour shape as a rice cake cake. (D2) (d
1) shows the diameters of the large and small containers (12) and (11), respectively.

Further, (14) is a rice cake pouring port that is punched into the center of the bottom surface of the lower large container (12) after molding, and is larger than the diameter (s1) of the concave circumferential groove (13). The rice cake is opened in a circular shape with a small diameter, and from here, a freshly moistened rice cake is poured into the filling container (A) by a rice cake injection nozzle of the rice cake filling machine described later.

In that case, the diameter (s2) of the rice cake pouring opening (14) is larger than the diameter (s1) of the concave groove portion (13) as long as the rice cake pouring nozzle (14) can be put in and taken out. The diameter may be increased to a larger diameter, and as shown in the modified embodiment of FIG. 4, a stable grounding seat (15) of a circular or rectangular shape is continuously integrated from the bottom surface of the lower large container (12) laterally outward. It doesn't matter if it overhangs.

In any case, in the periphery of the rice cake pouring port (14) which comes into contact with the seal cover described later, a group of tapered projections (16) having a tapered cross-section that are easy to release are provided in a concentric circle shape. It is preferably shaped.

In this way, although the filling container (A) is thicker than the seal cover described later in view of the shape retention strength of the rice cake, its melting temperature does not need to be set to be too high and the melting of This is because only the necessary portion of the filling container (A) provided with the projection group (16) can be melted easily and instantaneously, and can be efficiently welded and integrated with a seal cover described later. However, there is no problem even if the bottom surface of the lower large container (12) is formed into a flat by omitting the installation of the molten projection group (16).

FIG. 5 shows a filling action state of the rice cake in the filling container (A). In the filling operation, the filling container (A) is poured into the rotary receiving cylinder (17). The mouth (14) is set in a posture in which the mouth (14) is facing upward, and the rotation receiving cylinder (17) is inserted into the vertical rotation shaft (1).
8) Rotate about the vertical axis, and pour freshly sprinkled rice cake into the filling container (A) through the extrusion screw and the rice cake injection nozzle (19) from the hopper provided in the rice cake filling machine (not shown). As a result, under the influence of the rotating centrifugal force, the rice cake is quickly and completely filled in every corner of the filling container (A) without causing air accumulation.

Needless to say, the seal cover (B) for sealing the rice cake pouring opening (14) of the filling container (A) after filling the rice cake has a circular shape or a square shape larger than that of the rice cake pouring opening (14). None, moreover, as shown in FIGS. 6 and 7, the front sheet (20) and the back sheet (21) are preliminarily bonded and integrated as a slip sheet.

That is, the back sheet (21) of the seal cover (B) is made of the same thermoplastic synthetic resin as that of the filling container (A) itself, while the front sheet (20) is more heat resistant than the back sheet (21). It consists of different thermoplastic synthetic resins with high properties (melting temperature). Moreover, the overall wall thickness (t) of the interleaf sheet is made thinner than the thinnest portion of the filling container (A) itself.

In this respect, the filling container (A) having the illustrated internal capacity of −500 g is taken as an example.
Since the central portion of the top surface is dimensioned to have the weakest point of about 0.6 to 0.7 mm, the overall thickness (t) of the seal cover (B) is related to this.
Are sized, for example, to approximately 85 microns. In this case, since the front sheet (20) has high heat resistance, it is preferable to set the thickness to about 15 μm, which is thin, and the back sheet (21) to melt, so that the remaining 70 μm, to be thick, respectively.

The above-mentioned filling container (A) and seal cover (B)
The back sheet (21) can be made of, for example, polypropylene as long as they are the same thermoplastic synthetic resin, but they are made of polyethylene having a lower melting temperature (melting point) than polypropylene, while the front surface of the seal cover (B) is It is desirable to make the sheet (20) from highly heat resistant nylon with a greater melting temperature difference than its polyethylene.

By doing so, the back sheet (21) made of polyethylene and the filling container (A) can be instantaneously and efficiently welded and integrated while the heating temperature of the heat sealer is set lower than the melting temperature of nylon. This is because the front sheet (20) made of the nylon can be completely prevented from being thermally deformed.

The front sheet (2) of the seal cover (B)
0) is a display line (2) such as an explanatory text or an explanatory diagram for guiding the method of removing the rice cake from the filling container (A) as shown in FIG.
2) may be color printed so that it can be easily seen by consumers.

In any case, the seal cover (B) is welded and integrated to the bottom surface of the lower large container (12) so that the back sheet (21) and the filling container (A) are in direct contact with each other. (Heat-sealed) and the rice cake pouring opening (1
4) is sealed.

That is, in sealing the rice cake pouring port (14), the small container (11) is set so that the filling container (A) after pouring the rice cake is in an upwardly oriented posture as shown in FIG. The large container (12) is stably locked from above into the receiving frame (23) having a size that surrounds the.

Then, the seal cover (B) is attached to the rice cake pouring port (14) of the filling container (A) and the back sheet (2) thereof.
1) is placed so as to come into contact with the bottom surface of the large container (12), and then pressure is applied from above by the heating element (25) of the heat sealer (24). The heating element (25)
It goes without saying that the heating temperature given by is higher than the melting temperature of the back sheet (21) and lower than that of the front sheet (20).

Further, the heating element (2) of the heat sealer (24)
Of course, 5) has a ring shape corresponding to the peripheral portion of the rice cake pouring opening (14) provided with the above-mentioned molten projection group (16). Reference numeral (26) is a mounting bolt for the heating element (25), and the heating element (25) having a ring shape of different size can be exchanged and used by attaching and detaching the mounting bolt.

When the pressure is applied as described above, since the back sheet (21) of the seal cover (B) is made of the same thermoplastic synthetic resin as the filling container (A) itself, the seal cover (B) has a high affinity. The filling port (A) can be quickly and surely welded and integrated with each other, and the rice cake pouring port (14) can be maintained in a stable and firm sealed state.

In particular, according to the constitution in which the tapered melting projection group (16) as in the illustrated embodiment is formed at the contact portion with the seal cover (B) on the bottom surface of the filling container (A),
Only the melting projection group (16) of the necessary portion can be instantly melted, and can be efficiently welded and integrated with the seal cover (B) as shown in FIG. 9, and its durability can be improved.

On the other hand, the front sheet (2) of the seal cover (B)
Since 0) has higher heat resistance than the back sheet (21), there is no risk of thermal deformation even when subjected to the heating temperature of the heat sealer (24), and the display image line (22) printed on this is It can be kept sharp.
As the heat sealer (24), not only a heating plate that heats the heating element (25) by electricity but also a welder that heats by a high frequency or an ultrasonic wave can be adopted.

Filling container (A) sealed as described above
Is then immersed in boiling water at about 80-100 ° C for about 3
It will be boiled for sterilization for 0 to 40 minutes, and it will be continuously cooled (natural drying) for a certain period of time. The seal cover (B), which is thinner than the thinnest part of (A), will surely absorb and compensate for itself, and the central portion of the top surface, which is the weak point of the filling container (A) itself, will be depressed. Alternatively, there is no possibility of adversely deforming the contour shape illegally such that the contour expands.

[0036]

INDUSTRIAL APPLICABILITY As described above, in the present invention, as a sealing structure for a filling container for offering rice cakes, the rice cake pouring port (14) opened at the bottom of the filling container (A) blow molded from a thermoplastic synthetic resin is sealed. The seal cover (B) is provided with a back sheet (21) made of the same thermoplastic synthetic resin as the container (A) itself, and a front sheet made of a thermoplastic synthetic resin having higher heat resistance than the back sheet (21). (20) as a slip sheet, and the overall thickness (t) as the slip sheet,
The container (A) itself is made thinner than the thinnest part, and the seal cover (B) is attached to the back sheet (21) thereof.
Is in contact with the container (A), the container (A)
Since it is welded and integrated to the bottom surface of the above, there is an effect that the problems of the prior art described at the beginning can be improved.

That is, according to the above-mentioned constitution of the present invention, the seal cover (B) for sealing the rice cake pouring port (14) of the filling container (A) is a preliminary sheet of the front sheet (20) and the back sheet (21). The sealing cover (B) is composed of a slip-bonding body integrally bonded and glued, and its overall wall thickness (t) is made thinner than the thinnest portion of the filling container (A) itself. ), The filling container (A) is immersed in hot water, and the rice cake and the enclosed air expand during the sterilization boiling action.
Even if the rice cake shrinks during cooling, the expansion / shrinkage can be surely absorbed and compensated for by the seal cover (B), and the thinnest weak point of the filling container (A) itself. Therefore, it is possible to prevent the possibility of unauthorized deformation, and it is possible to obtain an elegant filling container (A) having a high commercial value as a rice cake.

The back sheet (21) of the seal cover (B) is made of the same thermoplastic synthetic resin as the filling container (A) itself, and is in direct contact with the bottom surface of the filling container (A). Since it is integrated by welding, it is possible to obtain a high affinity in the welded state, and it is excellent in the sealing effect and durability of the rice cake.

Particularly, if the configuration of claim 2 is adopted,
Only the necessary portion of the filling container (A) provided with the melting projection group (16) is instantaneously and efficiently melted to obtain a more stable and firm welded state with the seal cover (B). is there.

Further, since the front sheet (20) of the seal cover (B) is made of a thermoplastic synthetic resin having higher heat resistance than the back sheet (21), the heat sealer ( By means of 24), the back sheet (21) and the filling container (A) can be acted upon and can be welded and integrated instantly, and also when the front sheet (20) according to claim 3 is adopted, There is no possibility that the display image line (22) printed on this will be thermally deformed.

[Brief description of drawings]

FIG. 1 is an overall schematic perspective view of a filling container for offering rice cake according to the present invention.

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG.

FIG. 3 is a bottom view of FIG.

FIG. 4 is a cross-sectional view showing a modified example of the container corresponding to FIG.

FIG. 5 is a cross-sectional view showing a step of filling rice cake with a container.

FIG. 6 is a bottom view showing a seal cover extracted.

7 is an enlarged cross-sectional view taken along line 7-7 of FIG.

FIG. 8 is a cross-sectional view showing a process of welding a seal cover to a container.

FIG. 9 is a cross-sectional view showing a completed state of welding the seal cover to the container.

[Explanation of symbols]

 (11) -Upper small container (12) -Lower large container (14) -Mochi pouring port (16) -Melting protrusion group (20) -Front sheet (21) -Back sheet (22) -Printed display line (24) ) · Heat sealer (A) · Filling container (B) · Seal cover (t) · Wall thickness

Claims (3)

[Claims] 1. A seal cover (B) for sealing a rice cake pouring port (14) opened at the bottom of a filling container (A) blow-molded from a thermoplastic synthetic resin is provided with the same heat as the container (A) itself. A back sheet (21) made of a plastic synthetic resin,
A backing sheet (21) is used as a slip sheet with a front sheet (20) made of a thermoplastic synthetic resin having higher heat resistance, and the overall thickness (t) of the slip sheet is the container ( A) The seal cover (B) is made thinner than the thinnest part of the container itself, and the seal cover (B) is transferred to the bottom surface of the container (A) while the back sheet (21) is in contact with the container (A). A sealed structure for a filling container for rice cakes that is integrated by welding. 2. A taper-shaped melt projection group (1) is provided at a contact portion of a bottom surface of a filling container (A) with a seal cover (B).
6. The sealing structure for a container for filling rice cake according to claim 1, wherein 6) is shaped. 3. An explanatory text or an explanatory diagram for guiding a method of removing rice cake from the filling container (A) and other display lines (22),
The sealing structure for a container for filling rice cakes according to claim 1, wherein the sealing cover (B) is printed on the front sheet (20).