JPH05213375A - Production of easy open sealed package and same package - Google Patents

Abstract

PURPOSE:To perform heat sealing operation in a manner wherein any contamination occurring on the flange of a container upon filling the container with its contents is removed thoroughly therefrom to prevent the contents from mold or decay through distribution channel and wherein the requirements for both an adequate sealing strength to withstand the pressure exerted on the container from inside and outside and an easy unpacking possible with the fingers can be met. CONSTITUTION:In a sealant part of a container 1 and a lid 2 of a package A is formed a corrugated sealant layer 3 whose groove and ridge lines are made up by a thermocompression disk 7 having a number of groove and ridge bodies 8 formed alternately in a manner wherein the groove and ridge lines are arranged nearly parallel to one another and both the ends thereof are made open at the sealanr part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an easily openable sealed package used for filling and packaging foods in the food industry and the like, and an easily openable sealed package.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, a synthetic resin container having a flange 20 at the periphery of an opening has been used for filling and packaging foods.
The inside of 21 is filled with food such as jelly or water can to the upper edge of the opening, and the opening is closed by a synthetic resin lid 22 and the container 21 and the lid 22 are heat-sealed at the flange 20. That is, the sealed package 23 is obtained.

In heat-sealing the container 21 and the lid 22, first, as shown in FIG. 8 (a), the pressurizing surface is formed to be smooth in conformity with the outer shape of the container. The flat hot platen 24 or, as shown in FIG. 8 (d), the uneven hot platen 28 provided with the mesh-like uneven body 27 is used to cover the entire flange 20 width peripheral edge from the upper part of the lid 22. Primary sealing, and then, as shown in FIG. 8 (b) or FIG. 8 (c), by the convex hot platen 26 in which one or a plurality of concentric convex bodies are formed on the pressing surface, In addition, the container 21 and the lid 22 were fused by double heating and pressurizing the flange 20 of the container 21 from the upper part of the lid 22 by a secondary seal.

Generally, among food packages, food packages that are distributed at room temperature overflow the contents from the container flange for the purpose of preventing the contents from being oxidized or deteriorated in taste due to air content in the container. By doing so, full filling is conventionally performed to eliminate the mixture of air inside.

Therefore, at the time of heat-sealing, it is necessary to completely remove the contaminated contents existing between the container flange and the lid, which are attached at the time of filling, by pushing them out of the flange circumference by rolling by pressing the hot platen. is there.

[0006] Further, in this crimping, if a residual sealing portion due to poor heat sealing is not formed and the entire flange is not heat-bonded evenly, during the boil sterilization, retort sterilization, and water cooling / cooling steps usually performed after heat sealing, Residual contents that are adhered to the residual seal portion as a contaminant are present, which causes mold and decay in the distribution stage of the package, and also causes defective products that are abnormally opened due to external and internal pressures.

Therefore, it is said that the above-mentioned primary seal has a flat pressure which is likely to disperse the pressure receiving and a thickness variation in the flange 20 of the container 21 (generally, there is a variation of about ± 5% of the thickness). ) Is applied with a large pressing force to cover the joint failure due to), and in order to compensate for the insufficient seal strength, a secondary seal is applied by the hot press platen 25 as shown in Figs. 8 (b) to (C). To deal with the phenomenon that may occur as described above.

However, in the heat seal, the entire area in the width direction and the peripheral direction of the container flange is not maintained due to the attenuation of the pressing force, the thickness unevenness of the container material, the deformation / distortion, or the instability of the horizontal accuracy of the hot platen. It is difficult in terms of processing technology to completely heat bond without sealing, and in order to eliminate the occurrence of this unsealed portion, the temperature, pressure,
The pressurizing time is further increased, and as a result, the easy-open property of the lid body in the package is impaired.

Therefore, in the art, the package has a strong heat-sealing strength against internal pressure and external pressure, and also has an easy-open property that can be easily torn and opened by hand. There has been a strong demand for the appearance of an openable sealed package.

[0010]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned needs, and is formed by a hot platen having a large number of concaves and convexes at intervals in a sealant portion between a container and a lid in a package. The concavo-convex lines are substantially parallel to each other, and both end edges of the concavo-convex lines form a concavo-convex sealant layer that opens at the sealant portion, thereby reliably removing contaminated contents on the flange that adheres during filling during heat sealing. In addition to suppressing the occurrence of mold and decay during distribution, a heat seal that can satisfy both the robust seal strength that can withstand internal and external pressure sufficiently and the easy open property that can be easily opened by hand at the same time Of the two heat-sealing operations, one is performed by the heat-sealing operation according to the present invention, so that the desired sheet sealing can be performed. It is intended to provide a manufacturing method and easily openable sealed package of sex sealed package.

[0011]

Means for Solving the Problems The means of the present invention for achieving the above-mentioned object are a container having a flange at the periphery of an opening and having contents filled therein, and a heat seal at the flange with the opening closed. In the easily openable hermetically sealed package including the lid body, the lid of the lid body is formed on the pressing surface side by a plurality of concavo-convex bodies with both edges open and substantially parallel to each other at intervals. The flange of the container is pressed from above, and in the sealant portion of the easily-openable hermetically sealed package, the irregularities and voids of the heat-sealed portion are filled by the flow of the melted sealant layer, and the container and the lid are fused. The method for producing an easily-openable hermetically-sealed package.

Further, in a container having a flange at the periphery of the opening and filled with contents therein, a lid body which closes the entire surface of the opening and is heat-sealed at the flange, and a sealant portion between the container and the lid body. , An uneven sealant layer in which the uneven lines formed by a hot-pressing plate in which a large number of uneven bodies are engraved at intervals are substantially parallel, and both end edges of the uneven lines are opened at the sealant portion, easy-opening property In the structure of the hermetically sealed package.

Further, the uneven lines of the uneven sealant layer are formed in parallel with the opening direction of the lid member.

[0014]

The present invention configured as described above has the following operations. The contents are filled in a container having a flange formed around the entire circumference of the opening, and a lid is attached to cover the opening. By pressing the flange of the container from the upper part of the lid by a hot-press plate having a large number of bodies engraved at intervals, the container and the lid are fused and sealed in a sealed state in the sealant portion of the package. It

At this time, the sealant portion is pressed by the hot platen while being melted in a predetermined manner, and the contaminated contents of the pressed flange enter the concave portion from the convex portion, and This foreign matter content moves in the width direction or the length direction of the flange where the pressing force escapes, and is finally discharged from the peripheral edge thereof, so that the content on the flange may be reliably removed and remain. Absent.

Moreover, even if the material thickness of the container flange is uneven, the melted sealant portion flows due to the heat and pressure, and the thick portion is rolled and embedded into the thin portion, so that the entire area of the flange. Heat fusion is evenly performed in.

Of course, even in the case of opening, due to the uneven lines in the uneven sealant layer formed in parallel with the opening direction of the lid member, the tear is guided and the open easily by a slight force.

[0018]

Next, an example of a method for manufacturing an easily openable hermetically sealed package and an embodiment of the easily openable hermetically sealed package according to the present invention will be described with reference to the drawings. A in FIGS. 1, 2 and 6
Is an easily openable sealed package, which is a package that can be easily packaged at room temperature for hermetically packaging the contents of food such as jelly, water can, mousse, and cooked products. And a lid 2 that covers the container 1,
It is basically configured by a sealant layer 3 provided between the container 1 and the lid body 2.

The container 1 described above is a multi-layer material (three or more layers) in which a sealant film 1a having an easily cohesive fracture property, for example, is laminated on a metal base material 1b such as synthetic resin or aluminum foil in the innermost layer. Depending on the type of circle, oval or triangle,
A container 4 having a predetermined depth is formed in a polygonal shape such as a quadrangle or a hexagon to accommodate the contents, an opening 5 is formed on the entire upper surface of the container 4, and a flange 6 having a predetermined width is formed on the periphery thereof.
Has been extended.

The lid 2 is for closing the entire surface of the opening 5, and is a multi-layered material (three layers) in which the innermost layer sealant film 2a is laminated on a metallic base material 2b such as synthetic resin or aluminum foil. There is also the above.), And the size is formed so as to cover the opening 5 and the flange 6.

Then, the container 1 and the lid 2 are melted at their flanges 6 at a predetermined temperature, pressure and time by a hot press platen 7 as shown in FIGS. 70% or more is heat-bonded.

The hot platen 7 is made of metal having good heat conduction and provided with a heating means (not shown) such as a heater, and has a shape corresponding to the outer shape of the container 1, that is, from the peripheral edge of the flange 6 in the container 1. It is formed in a hollow hollow ring with a width of about 1.0 to 10 mm, and both edges are open on the pressing surface side, and the uneven lines 8a are aligned in the same direction, and continuous substantially parallel uneven bodies 8 are arranged at intervals. It is engraved in large numbers.

As shown in FIG. 4, the concave-convex body 8 is formed in a substantially wave-shaped groove 10 having a flat surface having a surface precision or a gently curved surface portion 9 on the pressing surface. It is preferable that the distance x is 0.4 to 1.5 mm, the groove depth y is 0.1 to 1.5 mm, and the groove angle z is 30 to 90 degrees.

Further, as shown in FIGS. 3 and 5, the uneven line 8a formed by the uneven body 8 has a cover material 2 and a sealant layer 3,
Alternatively, although it is formed in a straight line with the container flange 6, it may be formed in a gentle arc shape, which is not shown, and both ends of the flat surface portion 9 and the groove 10 described above may be formed. Since the edges 7a and 7b are open, the contaminant content or the melted sealant layer 3 can flow along the groove 10 and is parallel to the opening direction of the lid member 2, that is, the lid member. If the two knob portions 11 are formed so as to be substantially aligned with the peel direction (not necessarily aligned with the peel direction), at the time of the peel,
The uneven line 8a serves as a peeling guide to further enhance the easy-open property.

The above-mentioned sealant layer 3 is provided between the flange 6 of the container 1 and the lid member 2 to bond the two 1 and 2, and when they are hot pressed by the hot platen 7, , 2 of the sealant films 1a, 2a are melted, both of the sealants 1a, 1b flow to fill the bottom portion or the void portion, and the sealant films 1a, 2a are fused to each other.

Therefore, when heat sealing is performed using the hot press platen 7 having the irregularities 8, the flange 6 is used.
Due to the increase of the contact surface pressure against, even if the uniform accuracy of the thickness of the flange 6 deviates from the ideal range of 10%, the flat flange 6 reliably seals 70% of the surface area of the flange 6. Is possible and does not create a partial unsealed condition.

Further, in the overflow type full filling, the contents sandwiched between the flange 6 and the lid body 2 are pushed from the groove 10 toward the open portions at both end edges thereof by the pressing at the time of heat sealing. It can be moved and easily eliminated.

Even if the contents are not filled up completely, the contents may jump and adhere to the flange 6, but the contents are eliminated by the same action as described above, and the sealing is defective. Can be significantly reduced.

Then, even if the moisture adhering to the lid body 2 or the flange 6 of the container 1 due to the influence of the outside air temperature is evaporated by the heat of the heat seal to form bubbles, it should be eliminated in the same manner as described above. Is easy.

Although the curved upper surface of the flange 6 having a curved surface is evenly and uniformly sealed, the side surface of the hem portion of the flange 6 is difficult to seal. In this case, the hem portion of the flange 6 is not sealed. Since the gap between the side surface and the lid body 2 is formed to be relatively large, it is possible to clean the contaminated contents of the portion, and there are few troubles.

The manufacturing method in the embodiment of the present invention is as follows.
As shown in FIG. 2, in the heat-sealing of the container 1 and the lid body 2 in which the contents are filled, as described above, first, the pressurizing surface has concavo-convex shapes in which both end edges are open and are substantially parallel to each other. By the first hot press platen 7 in which a large number of bodies 8 are provided at intervals,
The flange 6 of the container 1 is primarily pressed from the upper portion of the lid body 2, and then an endless annular convex body 26 as shown in FIGS. 8B and 8C is attached to the pressing surface. The flange 6 of the container 1 is secondarily pressed from the upper part of the lid 2 by the second hot press platen 25 to form a convex line 26a for reinforcement, and in the sealant layer 3, the container 1 and the lid 2 are separated from each other. It is desirable to fuse the seals. In this case, the sealing strength is further improved, and it is possible to cope with the internal and external pressures during the circulation of the hermetically sealed package A, thereby ensuring the safety.

Further, in the case of double heating and pressurization by the above-mentioned first and second heat seals, in the primary pressurizing step, first, the second hot press platen 25 provided with the endless annular convex body 26 is attached.
After forming the one or a plurality of convex lines 26a by the above, the concave and convex lines 8a are formed by the first hot press plate 7 in which a large number of the above-mentioned concave and convex bodies 8 are engraved at intervals. Since it exerts the action effect of, as described above,
On the pressing surface side, the flange 6 of the container 1 is pressed from the upper portion of the lid body 2 by the hot pressing plate 7 in which a large number of concavo-convex bodies 8 having both open ends and substantially parallel to each other are engraved at intervals. In the sealant part of the easily openable hermetically sealed package A, the flow of the melted sealant layer 3 fills in the irregularities and voids of the heat seal part, so that the container 1 and the lid 2 are fused and sealed. In the method of manufacturing the package A, the order of the processing states in the primary and secondary processing is not particularly limited.

(Example) Next, an example of carrying out the hermetically sealed package A by the manufacturing method of the above-described embodiment of the present invention will be described.

A multi-layer sheet formed by coextrusion of polypropylene-based and polyethylene-based resin was used to form a vacuum forming method, and the upper end opening had a diameter of 67 mm, a flange outer shape of 78 mm, a flange width of 5.5 mm, and one end of the flange. A bottomed circular container having a crow mouth portion (opening starting portion) of a substantially isosceles triangle was molded.

This container was filled up with jelly containing 90% of melon pulp paste by the overflow method, and as a lid material, the base material layer was a biaxially stretched 6 nylon film, and the sealant layer was a crystalline propylene resin and polyethylene. A lid made of a blend of resin is formed, and this lid is
After supplying to the said container, it heat-sealed with the hot-press board in a cup sealer.

This hot platen is made of brass and has an annular shape which is 5 mm wider than the width of the container flange and the width of the cormorant, and the surface has a groove of 0.5 mm, a depth of 0.35 mm and an angle of 60 degrees, which is opened at the tip of the corral. They were formed uniformly at intervals in a direction coinciding with a straight line connecting the center points of the parts, and were set so that the center of the container and the center of the hot platen coincided with each other.

With this hot platen, the hot platen temperature 20
Under the conditions of 0 ℃, contact surface pressure 38Kg / cm ² , time 1.7 seconds,
Heat sealing was performed from the upper surface of the lid.

After heat sealing, sterilization at 85 ° C. for 25 minutes under normal pressure and water cooling were performed, and as a result, the entire flange including the corral was completely bonded without any unsealed portion, and the internal pressure strength was 0.7 kg /
It has a cm ² and a sealing strength of 1.76Kg / 15mm, and has sufficient protection strength. If it was manually peeled off from the crow mouth toward the center point of the container, it could be easily and easily opened. ..

In addition to the above-described primary seal, as a second hot platen, a single line of convex ribs having a rib width of 2.0 mm and a rib height of 1.0 mm is formed in an annular shape so that it is located at the center of the container flange width. Installed in.

Then, using this second hot platen, secondary heat sealing was carried out from the upper surface of the lid under the conditions of a hot platen temperature of 200 ° C., a contact surface pressure of 53 Kg / cm ² , and a time of 1.7 seconds.

Internal pressure strength 0.9Kg / cm ² , seal strength 2.27Kg / 1
It showed 5 mm and had more reliable protection strength.

[0042]

As described above, the method for manufacturing the easily-openable hermetically sealed package and the easily-openable hermetically sealed package of the present invention have a large number of irregularities at intervals in the sealant portion between the container and the lid of the package. The concavo-convex lines formed by the engraved hot platen are substantially parallel to each other, and both end edges of the concavo-convex lines form a concavo-convex sealant layer that opens in the sealant portion, so that there is no unsealed portion in the entire flange. In addition to being able to reliably seal, it is possible to prevent contaminants adhering to the flange at the time of filling from being reliably removed at the time of heat sealing to cause mold and decay during distribution, or to suppress the intrusion of dust. it can.

In addition, even if the container or the lid base material has uneven thickness, relatively uniform heat bonding can be performed, and a strong seal strength capable of withstanding internal and external pressures even in a single heat seal is obtained. Also, due to the substantially parallel uneven lines formed by the hot platen, the uneven lines serve as an opening guide,
It can be opened smoothly and easily by hand. It has special effects such as.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an easily openable hermetically sealed package according to the present invention.

FIG. 2 is a vertical cross-sectional view showing an enlarged cross-section of a part of FIG.

3 is a bottom view showing the hot platen in FIG. 1. FIG.

FIG. 4 is an explanatory view showing an enlarged concavo-convex body of the hot platen in FIG.

5 is a bottom view showing another example of the hot platen in FIG. 1. FIG.

FIG. 6 is a plan view showing an example in which a secondary seal is applied to the easily openable hermetically sealed package in FIG.

FIG. 7 is a vertical cross-sectional view showing a conventional easy-open sealed package.

8 is a plan view showing each example of a hot platen used for heat-sealing the easily openable hermetically sealed package in FIG. 7. FIG.

[Explanation of symbols]

 A Easy-to-open hermetically sealed package 1 Container 2 Lid 3 Sealant layer 5 Opening 6 Flange 7 Hot platen 8 Uneven body 8a Uneven wire

Claims (3)

[Claims] 1. An easily-openable hermetically sealed package comprising a container having a flange at the periphery of the opening and having contents filled therein, and a lid body that closes the opening and is heat-sealed at the flange. On the side, by a hot platen having a large number of concavo-convex bodies which are open in parallel and which are open in parallel at both ends and are continuously engraved, the flange of the container is pressed from the upper part of the lid body,
In the sealant portion of the easily-openable hermetically-sealed package, the irregularities and voids of the heat-sealing portion are filled by the flow of the melted sealant layer, and the container and the lid are fused to each other. Method for manufacturing hermetically sealed package. 2. A container having a flange at the periphery of the opening and having contents filled therein, a lid body which closes the entire surface of the opening and is heat-sealed at the flange, and a sealant portion between the container and the lid body. A concave-convex sealant layer in which the concave-convex lines formed by a hot-pressing plate in which a large number of concave-convex bodies are engraved at intervals are substantially parallel to each other, and both end edges of the concave-convex lines are opened at a sealant portion. Easy to open and sealed package. 3. The easily openable sealed package according to claim 2, wherein the uneven line of the uneven sealant layer is formed in parallel with the opening direction of the lid member.