JP3953160B2 - Container spout sealing method and container with spout - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for sealing a spout of a container for storing a drink such as a sports drink, juice, jelly and the like and a container with a spout, particularly for foods that require retort sterilization such as liquid food, coffee, soup, etc. The present invention relates to a method for sealing a spout of a container having suitable heat resistance and a container with a spout.
[0002]
[Prior art]
Bag-like containers with spouts can be slightly deformed and are easily accommodated in bags, etc. It has become widespread. As disclosed in JP-A-7-329218, this type of container with a spout has an opening portion in a state in which the spout is sandwiched between openings of a bag-shaped container body formed by sheet material. In general, a method of heat-pressing with a pair of pressure bodies is employed.
[0003]
Bag-shaped containers with such spouts are currently used as beverage containers that do not require retort sterilization, such as juice, but in the future, liquid foods, pasta sauces, coffee drinks, etc. Thus, it is desired to use it as a container for food that must be sterilized by retort after filling the contents.
[0004]
By the way, since the retort sterilization treatment is normally heat sterilized at a high temperature of 121 ° C. or higher, a container filled with food that requires retort sterilization such as liquid food has heat resistance that can withstand the heat during retort sterilization. It is conceivable to use a container having an inner surface formed of a polypropylene resin having excellent heat resistance, instead of a conventionally used container having an inner surface formed of polyethylene.
[0005]
[Problems to be solved by the invention]
By the way, a laminate film (sheet) whose inner surface is made of a polyethylene-based resin, which is generally used as a material for a container with a spout (a pouch with a cap) that is currently used as a container for beverages and the like that do not require retort sterilization The ground) has a wide temperature range that can be welded, and the welding temperature is lower than the melting point, so that the spout portion can be welded relatively quickly in the welding process by sandwiching the seal bar. Similar to the welded integrated part between the grounds, a sufficient seal strength could be ensured for the welded integrated part between the inner surface of the sheet base and the spout part formed of the same polyethylene resin.
[0006]
However, in the case of a container with a spout formed by a polypropylene resin having excellent heat resistance as described above, for example, a spout made of polypropylene resin and a CPP film (unstretched polypropylene resin film) on the inner surface side When a container is manufactured by thermocompression bonding with a bag-like container body formed by a sheet base material laminated with the following problems, there are the following problems.
[0007]
That is, when the thin sheet base forming the container body is heat-pressed, both CPP films are uniformly deformed and melted to obtain a good sealing state. When heat and pressure bonding with a meat spout, the CPP film on the sheet base side with a small heat capacity is melted, and then the PP spout with a large heat capacity is melted. Leaks to the outside of the sheet material, and the seal thickness (CPP film thickness) on the container body side becomes thin, so that sufficient seal strength cannot be secured in the welded integrated part of both, causing leakage. It has become one of the.
[0008]
Therefore, the problem of the present invention is that even when the container main body and the spout portion are formed of a material such as polypropylene resin having excellent heat resistance as described above, it is sufficient for the welded integrated portion of the container main body and the spout. An object of the present invention is to provide a container outlet portion sealing method for a container capable of ensuring sealing strength and a container with an outlet sealed by the method.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that the polypropylene base resin is formed in the opening of the container body formed by forming a sheet base in which an unstretched polypropylene base resin film is laminated on the inner surface of the exterior sheet. With the formed spout inserted, the container main body and the spout are fused and integrated by sandwiching and pressurizing the opening of the container main body with a pair of heated pressurizing bodies. A method for sealing a spout of a container, wherein the sheet base is one having a thickness of the unstretched polypropylene resin film in the range of 60 to 100 μm, and the spout is formed on the sheet base. and that said compared to unstretched polypropylene resin film, the melting point is formed by 5 to 10 ° C. lower polypropylene resin, the pressing surface of the pressure body, its Extending along the longitudinal direction of the pressure surface, the protruding height is set to 50 to 100% of the thickness of the unstretched polypropylene resin film forming the sheet base, and the width direction of the pressure surface A plurality of places are formed in a state of being separated from each other, and using the pressurizing body on which these ridges are formed, while preventing the outflow of unstretched polypropylene resin on the inner surface of the sheet base of the melted container body to the outside The container spout portion sealing method for the container in which the container main body and the spout port are welded and integrated is provided.
[0010]
When the container body and the spout are welded and integrated by the method as described above, the thick portion of the sheet base extending along the opening of the container body and the meat are integrated into the welded integrated part of the container body and the spout. since sheeting on both sides of the thick portion is thin portion recessed in a concave is always formed, both the sufficient sealing strength at its thick portion is secured, the container body and spout when integrally welded The effect that the sealing time can be shortened is obtained.
[0011]
In addition, as in the invention according to claim 2, the opening formed in the container body formed by forming the sheet material in which the unstretched polypropylene resin film is laminated on the inner surface of the exterior sheet into a bag shape is formed of the polypropylene resin. In a state where the outlet is inserted, the container main body and the spout are welded and integrated by pouring the container main body with an opening portion of the container main body with a pair of heated pressurizing bodies to apply pressure. The container with an outlet, wherein the unstretched polypropylene resin film forming the sheet base is set to a thickness of 60 to 100 μm, and the spout is the unstretched polypropylene forming the sheet base. Formed of a polypropylene resin having a melting point of 5 to 10 ° C. lower than that of the resin film, and extends to the pressing surface of the pressing body along the longitudinal direction of the pressing surface. That the projections, the formed plurality of positions in a state away from each other in the width direction of the pressing surface, using these ridges are formed pressure member, cast polypropylene of the sheeting of the inner surface of the container body was melted In the case where the container main body and the spout are integrated to form the spout part so as to prevent the outflow of the resin-based resin to the outside, a weld integrated part of the container main body and the spout is provided. In addition, a thick part of the sheet material extending along the opening of the container body and a thin part in which the sheet material is recessed in a concave shape are always formed on both sides of the thick part, and sufficient sealing strength is provided in the thick part. Is secured, and the sealing time when the container body and the spout are integrated by welding can be shortened.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a container (pouch) formed by welding and integrating a bag-like container body 1 and a spout 2. As shown in FIG. 2, the container body 1 before welding and integrating the spout 2 is a CPP film (unstretched polypropylene resin film) on the inner surface of an exterior film in which a polyethylene terephthalate film, an aluminum foil, and a polyamide film are sequentially laminated. 2) are laminated in a bag shape, and the periphery thereof is heat-bonded and integrated by welding, and the opening 4 is formed as an unwelded portion only on one end side.
[0013]
A spout (also referred to as a spigot or spout) 2 for injecting and pouring contents into the container body 1 is made of PP (polypropylene resin) formed in a straw shape. It is configured so that it can be plugged with a screw cap 5 or the like indicated by a virtual line. In addition, 1a is a seal | sticker part formed at the time of preparation of the container main body 1. FIG.
[0014]
The container body 1 and the spout 2 are integrated by welding using a sealing device A shown in FIG. As shown in the figure, the sealing device A includes a pair of levers 7 and 7 that can be opened and closed by a support shaft P that is disposed opposite to each other, and seal bars 6 and 6 that are attached to the ends of the levers 7 and 7. The lever 8 is composed of a cylinder 8 that opens and closes simultaneously, and the portion corresponding to the spout 2 of the pressure surface 9 of the seal bar 6, 6 is shown in FIG. 4 and FIG. Elongated ridges 10 extending along the longitudinal direction (the opening width direction of the container body 1) are formed at both ends and the center of the pressure surface 9 in the width direction. The seal bar 6 includes heating means and cooling means (not shown), and is heated by these means or cooled to lower the heated temperature.
[0015]
First, as shown in FIG. 2, in the state where the spout 2 is inserted into the opening 4 of the container body 1, the opening 4 portion of the container body 1 is paired with a pair of heated seals in the open state shown in FIG. As shown in FIG. 6, by sandwiching between the bars 6 and 6 and subsequently operating the cylinder 8 to close and pressurize the seal bars 6 and 6 as shown in FIG. A spout part 12 in which the container body 1 and the spout 2 are integrated with each other and a seal part 1A in which the opposing sheet bases 3 and 3 are integrated with each other are formed simultaneously.
[0016]
FIG. 4 shows a state immediately before sealing, and FIG. 5 shows a state immediately after sealing by the sealing device A. In FIG. 5, 3a indicates an exterior film, and 3b indicates a CPP film.
[0017]
In the spout portion 12 formed as described above, as shown in FIG. 5, the portion pressed by the ridge 10 is formed with a recessed portion 11 that is largely recessed by the applied pressure, and the spout 2. Is a state in which a slightly recessed dent 2a is formed, and the portion pressed by the flat portion 9a other than the ridge 10 on the pressing surface 9 is thicker than the thickness of the dent 11 because the applied pressure is small. 13 is formed, and the spout 2 is in a state in which almost no dent is formed on the surface thereof.
[0018]
Moreover, since the sheet | seat base 3 and the spout 2 are welded with a strong pressure in the ridge 10 part, although the thickness of the CPP film 3b of the sheet | seat 3 becomes quite thin, the part pinched | interposed into the ridges 10 and 10 Since the applied pressure is small, the thickness of the melted CPP film 3b does not become extremely thin and is well welded to the spout 2.
[0019]
This is because when the heated seal bar 6 pressurizes the sheet base 3 and the spout 2, first, the CPP film 3 b of the sheet base 3 is melted first. This is because the ridges 10 and 10 formed at both ends in the width direction of the pressure surface 9 of the seal bar 6 prevent the melted CPP film 3b from flowing out while trying to flow out to the outside of the seal portion due to pressure. A good appearance with no protrusion from the sheet base 3 and a sufficient seal strength can be ensured.
[0020]
Thereby, the container main body 1 will be in the state completely sealed by this seal part 1A and the seal part 1a formed previously, and the leakage of the contents other than the spout 2 will be prevented reliably.
[0021]
In addition, although the protrusion height of the protruding item | line 10 formed in the pressurization surface 9 of the seal bars 6 and 6 can be set to 0.02-0.2 mm, it is 50-100% of the thickness of the CPP film 3b. It is better to set the thickness. For example, if the thickness of the CPP film 3b is 60 to 100 μm, the height of the ridges 10 is set to 0.03 mm to 0.1 mm. Further, the ridges 10 need to be formed in at least two places so that concave parts are formed therebetween, and may be four or more places.
[0022]
The sealed container, in which the container body 1 and the spout 2 are welded and integrated by the above sealing method, is a food that requires retort sterilization treatment, that is, liquid food, pasta sauce, soups, coffee drinks, tea, etc. Can be used as a container.
[0023]
Further, in the above-described embodiment, the ridges 10 of the seal bar 6 are provided only on the portions corresponding to the spouts 2 of the pressurizing surface 9, but as shown by the phantom lines in FIG. 10 may be extended in the longitudinal direction of the pressing surface 9 so as to be formed over substantially the entire width of the seal portion 1A between the sheet bases 3 and 3.
[0024]
However, when the ridge 10 is formed over substantially the entire width of the seal portion 1A between the sheet bases 3 and 3, as shown in FIGS. 8 and 9, the ridges 10 and 10 in a pair of opposed seal bars 6 and 6 are provided. Are preferably shifted from each other. When the protruding strips 10 and 10 formed on the pair of opposing seal bars 6 and 6 are provided at positions facing each other, the portion where the sheet bases 3 and 3 are welded to each other is This is because the seal thickness becomes extremely thin.
[0025]
Also, among the three ridges 10, the height of the ridge 10 and its width can be set variously, such as by reducing the height of the central ridge 10, such as the container body 1 and the spout. The size, material, and the sealing area of both of these may be appropriately set.
[0026]
Moreover, you may make it form the convex part and uneven | corrugated pattern lower than the convex strip 10 on the pressurization surface 9 of the seal bars 6 and 6 other than the convex strip 10 mentioned above.
[0027]
Further, as the polypropylene resin forming the CPP film 3b and the spout 2, a propylene ethylene random copolymer can be used, and as the polypropylene resin forming the spout 2, the CPP film 3 b For example, it is preferable to use a resin having a melting point of about 5 to 10 ° C. lower than that of the polypropylene resin forming the sealant because the sealing time can be shortened.
[0028]
In the above-described embodiment, the CPP film 3b and the spout 2 are formed of a polypropylene-based resin. However, the present invention is not limited to this, for example, a linear shape that has been conventionally used. The present invention can also be applied to those formed of a polyethylene resin such as low density polyethylene or a polyester resin having heat sealability.
[0029]
In the above-described embodiment, the container body 1 has been described as having a flat bag shape made of two sheets. However, the container body has a side gusset shape or a standing pouch shape in which a folded portion is formed at the bottom. It may be.
[0030]
【The invention's effect】
As described above, in the present invention, a plurality of protrusions extending along the longitudinal direction are formed on the pressing surface of the pressing body in a state of being separated from each other in the width direction of the pressing surface, and these protrusions are formed. Since the container body and the spout are welded and integrated using the pressurizer, the sheet base of the container main body melted before the spout is blocked by the ridges formed on the pressurizer. Outflow of the unstretched polypropylene resin film on the inner surface of the container is prevented, and there is always a thick part in the welded and integrated part of the container body and spout. Strength is secured.
[Brief description of the drawings]
FIG. 1 is an overall side view showing a container with a spout.
FIG. 2 is a perspective view showing a relationship between a container body and a spout before a sealing process.
3A is a schematic side view of the sealing device showing a state in which a seal bar of the sealing device is open, and FIG. 3B is a schematic side view showing a state in which the seal bar of the sealing device is closed.
FIG. 4 is a cross-sectional view of a spout portion of a container showing a state immediately before being thermocompression bonded by a sealing device.
FIG. 5 is an enlarged cross-sectional view showing a state of a seal portion immediately after thermocompression bonding.
FIG. 6 is a perspective view showing a spout portion of the container after being sealed.
FIG. 7 is a cross-sectional view showing a state of being sandwiched between a pair of seal bars.
FIG. 8 is a cross-sectional view of a spout portion of a container showing another embodiment.
FIG. 9 is a cross-sectional view of a welded portion between sheet bases of the same container.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Container main body 2 Outlet 3 Sheet | seat base 3a Exterior film 3b CPP film 4 Opening 6 Seal bar 9 Pressurization surface 10 Projection 11 Depression part 13 Thick part

Claims (3)

In a state where a spout formed of a polypropylene resin is inserted into an opening of a container body formed by forming a sheet of a non-stretched polypropylene resin film laminated on the inner surface of the exterior sheet into a bag shape, a pair of heated A method for sealing a spout portion of a container in which the container main body and the spout are integrated by welding by sandwiching and pressurizing the opening portion of the container main body with a pressurizing body,
As the sheet base, use the one in which the thickness of the unstretched polypropylene resin film is in the range of 60 to 100 μm,
The spout is formed of a polypropylene resin having a melting point lower by 5 to 10 ° C. than the unstretched polypropylene resin film forming the sheet base,
The pressure height of the pressure body is set to 50 to 100% of the thickness of the unstretched polypropylene-based resin film extending along the longitudinal direction of the pressure surface and forming the sheet base. A plurality of protruding ridges are formed in a state where they are separated from each other in the width direction of the pressure surface, and a non-stretched polypropylene on the inner surface of the sheet base of the container body is melted by using a pressure body in which these ridges are formed. A method for sealing a spout part of a container , wherein the container body and the spout are integrated by welding while preventing the outflow of the system resin to the outside . In a state where a spout formed of a polypropylene resin is inserted into an opening of a container body formed by forming a sheet of a non-stretched polypropylene resin film laminated on the inner surface of the exterior sheet into a bag shape, a pair of heated A container with a spout provided with a spout part in which the container main body and the spout are welded and integrated by sandwiching and pressurizing the opening portion of the container body with a pressurizing body,
The thickness of the unstretched polypropylene resin film forming the sheet base is set to 60 to 100 μm,
The spout is formed of a polypropylene resin having a melting point lower by 5 to 10 ° C. than the unstretched polypropylene resin film forming the sheet base,
A plurality of protrusions extending along the longitudinal direction of the pressure surface are formed on the pressure surface of the pressure body in a state of being separated from each other in the width direction of the pressure surface, and the pressure body on which the protrusions are formed is formed. The container main body and the spout are integrated to form the spout portion so as to prevent outflow of the unstretched polypropylene resin on the inner surface of the sheet base of the melted container main body to the outside. A container with a spout. In a state where a spout formed of a polypropylene resin is inserted into an opening of a container body formed by forming a sheet of a non-stretched polypropylene resin film laminated on the inner surface of the exterior sheet into a bag shape, a pair of heated A container with a spout provided with a spout part in which the container main body and the spout are welded and integrated by sandwiching and pressurizing the opening portion of the container body with a pressurizing body,
The unstretched polypropylene-based resin film forming the sheet base is set to a thickness of 60 to 100 μm,
The spout, in comparison to the unstretched polypropylene resin film forming the sheeting is formed by a melting point of 5 to 10 ° C. lower polypropylene resin,
A plurality of protrusions extending along the longitudinal direction of the pressure surface are formed on the pressure surface of the pressure body in a state of being separated from each other in the width direction of the pressure surface, and the pressure body on which the protrusions are formed is formed. The spout portion is configured by welding and integrating the container body and the spout using ,
A thickened portion of the sheet base extending along the opening of the container main body, and a thickened portion thereof, in the welded integrated portion of the container main body and the spout and the welded integrated portion of the opposing sheet bases. Thin portions where the sheet ground is recessed in a concave shape are formed on both sides of
A container with a spout, in which the thin portion formed on the opposite one sheet base side and the thin portion formed on the other base sheet side are displaced from each other.

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