JP2015077984A - Tetrahedron package and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easily-openable tetrahedron package which can be manufactured by a continuous process while being formed into a tube-like shape from a belt-like plastic sheet; and to provide a method for manufacturing the same.SOLUTION: In a method for manufacturing a food package, a continuous belt-like directional film which can be easily opened in a long direction is used; the film is formed into a tube-like shape by pressing and joining both sides of the belt-like directional film together; a lower connection part with a predetermined width is formed at a lower end part of the tube; a content is put into the tube from an upper opening of the tube; and an upper connection part is formed in a direction perpendicular to the lower connection part. The part where both sides of the film are pressed and joined together is set at a position deviated from the center between the lower connection part and the upper connection part.

Description

The present invention relates to a food packaging body having a substantially tetrahedral shape and a method for manufacturing the same.

A package of food having a substantially tetrahedral shape has been popularized under the trade name of Tetra Pak (registered trademark). Such a package has been used mainly for packaging beverages such as milk. In this case, a hole for inserting a straw is formed near the apex of the tetrahedron, and a seal is pasted thereon. In use, peel off the seal to expose the hole, insert a straw and drink. In this case, the package itself is not cut open. However, with the spread of rectangular parallelepiped paper pack beverages, such tetrahedral beverage packs are hardly used.

Patent Document 1, Patent Document 2, and the like describe food packages having similar shapes. These food packages are provided as flat bag-shaped packaging materials. Both edges and the lower side of the two rectangular plastic films are connected, and the upper side is not connected. In the subsequent process, the upper part of the bag is opened, food is put in, and the upper side part is closed so that it is perpendicular to the lower side part to form a tetrahedral food packaging.

At this time, connection portions provided on both the left and right edge portions of the bag appear from the center of the upper side of the tetrahedron to the lower side. By cutting out along this connection part, a package becomes the shape of a boat-shaped saucer.

JP 2010-89906 A Utility Model Registration No. 3178891

The package described in Patent Document 1 and Patent Document 2 can form a tetrahedral food package, and can be cut downward from the upper side. However, in any case, the process of forming the bag-shaped packaging material and the process of enclosing the food to form the tetrahedral package are completely separated. In particular, opening the upper side of the flatly folded bag is a cumbersome operation. Furthermore, in the invention of Patent Document 1, the connection between the lower side portion and the side side portion is formed by fusing, but this does not allow a strong connection. In addition, when the tetrahedron is formed, the connecting portion of the side portion corresponds to an opening line directed downward from the center of the upper side portion. The patent application according to Patent Document 1 is withdrawn without being requested for examination.

An object of the present invention is to provide a tetrahedral package that can be manufactured in a continuous process while forming a tube shape from a band-shaped plastic sheet and that can be easily opened, and a method for manufacturing the same.

In order to solve the above problems, in the method for producing a food package of the present invention, a continuous strip-shaped directional film having easy-openability in the length direction is used, and both sides of the strip-shaped directional film are held in both hands. The tube is joined together to form a tube, and a lower connection portion having a predetermined width is formed at the lower end portion of the tube. Contents are introduced from the upper opening portion of the tube, and the upper connection portion is perpendicular to the lower connection portion. Is formed so that the joint portion of both hands is shifted from the center of the lower connection portion and the upper connection portion. A hot-melt adhesive is applied to the first surface of the directional film, and a tube is formed so that the first surface is on the inner side. It is preferable to form by thermocompression bonding.

Further, the tetrahedral package of the present invention is formed of a directional film having easy-openability, and includes a lower connection portion, an upper connection portion in a direction perpendicular to the lower connection portion, and an upper connection from the lower connection portion. The joint part of both hands formed in a part is provided, and the joint part of both hands joint is provided in the position shifted from the center of a lower connection part and an upper connection part. Furthermore, it is preferable that a notch for starting opening is provided at the center of the upper connecting portion.

The tetrahedral package of the present invention can be easily opened while having sufficient sealing performance. According to the method for producing a tetrahedral package of the present invention, a package in which food is enclosed from a band-shaped plastic sheet can be produced in a series of continuous steps.

It is a front view which shows typically the manufacturing method of a tetrahedral package. FIG. It is a perspective view which shows a tetrahedral package. It is a front view which shows the unsealed state of a food packaging body.

EMBODIMENT OF THE INVENTION The form for implementing this invention is demonstrated in detail based on drawing. FIG. 1 is a front view schematically showing a method for producing a tetrahedral package, and FIG. 2 is a cross-sectional view taken along the line AA.

In this method for manufacturing a tetrahedral package, a strip-shaped directional film 1 is used as a material. A directional film is a film that is stretched in a specific direction at the time of manufacturing a plastic film and has a property (easy-opening property) in which a cutting line easily proceeds along that direction. Here, it has easy-openability along the length direction. Further, a hot-melt adhesive is applied to the first surface of the directional film 1.

The width of the directional film 1 is obtained by adding the matching width of the two-handed connecting portion to twice the length of the upper and lower sides of the tetrahedral package to be manufactured. This strip-shaped directional film 1 is provided upstream in a state of being wound around a paper tube or the like, and is continuously supplied therefrom.

The band-shaped directional film 1 is guided to the guide member 2 and is formed into a tube shape by having both sides aligned with each other with a predetermined width. Here, a hot-melt adhesive is applied to the first surface of the directional film, and the tube is formed so that the first surface is inside. On the other hand, the hot-melt adhesive is not applied to the second surface that is outside the tube. The two-hand matching portion is heated when passing through the heating roller 3 to form a two-handed connecting portion 11.

In this manufacturing apparatus, two pairs of heat sealing members 4 and 5 are provided. Each of the heating seal members 4 and 5 is provided with a pair of heating bars and can be freely opened and closed. The two pairs of heating seal members 4 and 5 are arranged in directions perpendicular to each other, and can also move up and down without interfering with each other.

In FIG. 1, the first heat sealing member 4 grips the lower end portion of the tube, thereby forming a lower connection portion 12 having a predetermined width. On the other hand, the second heat seal member 5 stands by at a position away from the tube in the upper part. Therefore, the upper part of the tube is in an open state.

On the upstream side of the heating roller 3, both side portions of the directional film are not connected and are not in the shape of a tube. Food can be fed into the tube through the food inlet 6.

When the food is put in, the second heating seal member 5 waiting at the top closes and grips the top of the tube. Here, the heating seal members 4 and 5 and the heating roller 3 are arranged so that the joint portion 11 of both hands is located at a position shifted from the center of the lower connection portion 12 and the upper connection portion 13. Thereby, the upper connection part 13 of a predetermined width is formed. In this way, a tetrahedral package as shown in FIG. 3 is formed.

Through the above steps, an integral tetrahedral package is made from the band-shaped directional film 1. Next, the first heat seal member 4 opens the tube and rises to the height at which the second heat seal member 5 was located. On the other hand, the second heat seal member 5 is lowered to the height at which the first heat seal member 4 was first in the state where the tube is gripped. Thus, the upper end portion 13 of the tetrahedral package is lowered to the position where the lower end portion 12 was located. The directional film 1 is newly drawn out by this lowered length, and the production of the next tetrahedral package starts. The upper end portion 13 held by the second heat seal member 5 also becomes the lower end portion 12 of the tetrahedral package to be produced next. By repeating the above steps, a tetrahedral package in which food is enclosed is sequentially produced. One tetrahedral package may be separated as much as possible, or may be separated individually after a plurality of tetrahedral packages are formed in a bead shape.

FIG. 3 is a perspective view showing a tetrahedral package. It is made by the above-described manufacturing method and is separated individually. The tetrahedral package 10 is made of a directional film, has a connection portion at each of an upper portion and a lower portion, and the upper connection portion 13 is in a direction perpendicular to the lower connection portion 12. The easy-opening property of the directional film is perpendicular to the upper connection portion 13 and the lower connection portion 12.

Furthermore, the joint portion 11 of both hands is formed at a position shifted from the center of the lower connection portion 12 and the upper connection portion 13. Here, it is provided at a position approximately one third of the width from the end of the upper connecting portion 13. For example, in the example of FIG. 3, the width of the lower connecting portion 12 and the upper connecting portion 13 is 14 cm, and the joint portion 11 with both hands is located at a position 5 cm from the left end of the upper connecting portion 13.

The upper connection part 13 is provided with a notch 14 for opening opening. The opening notch 14 is formed at a position shifted from the joint 11 where both hands are aligned. In particular, it is preferable to provide the central portion of the upper connection portion.

When eating food, the upper connection portion 13 is pinched and pulled left and right to open the food. Since a notch 14 for opening start is formed at the center of the upper connecting portion 13, opening can be easily started from here. Since the easy-opening property of the directional film is perpendicular to the upper connecting portion 13, the cutting line proceeds directly downward, and the package is completely opened. FIG. 4 is a front view showing an opened state of the food package. When opened, the food package has the shape of a boat-shaped tray, so that the food x inside can be taken out and eaten as it is.

Since both joints 11 can be formed with a sufficient connection width, this tetrahedral package 10 has good sealing performance and strength. Therefore, it is difficult to open even if force is applied during transportation, and the food inside can be kept fresh for a long period of time. The two-handed joint 11 is hard and difficult to cut, but in the tetrahedral package 10 of the present invention, the portion without the two-handed joint 11 is opened, so that it can be easily opened.

1. 1. Strip-shaped directional film Guide member 3. 3. Heating roller 4. first heat seal member Second heat sealing member 6. 10. Food inlet Tetrahedral package 11. Joint joint of both hands 12. Lower connection part 13. Upper connection part 14. Notch for opening opening x. Food

Claims (4)

Using a continuous belt-shaped directional film with easy opening in the length direction, joining both sides of the belt-shaped directional film together with both hands to make a tube, and connecting the lower part of the tube to the lower end of a predetermined width Part is formed, the contents are charged from the upper opening of the tube, and the upper connecting part is formed in a direction perpendicular to the lower connecting part to produce a tetrahedral package, and both hands are joined together. A method of manufacturing a tetrahedral package in which the part is located at a position shifted from the center of the lower connection part and the upper connection part. A hot-melt adhesive is applied to the first surface of the directional film, and a tube is formed so that the first surface is on the inner side. The manufacturing method of the tetrahedral package of Claim 1 formed by thermocompression bonding It is formed of a directional film with easy opening, and has a lower connection part, an upper connection part perpendicular to the lower connection part, and a two-handed joint formed from the lower connection part to the upper connection part. And the tetrahedral package which the joint part of both hands alignment is provided in the position which shifted | deviated from the center of the lower connection part and the upper connection part. The tetrahedral package according to claim 3, wherein a notch for opening is provided at a central portion of the upper connecting portion.

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