JP3423961B2 - Food packaging and packaging method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention related to the method of packaging a package and this food containing a paste-like food.

[0002]

2. Description of the Related Art Heretofore, as a relatively simple packaging method for paste-like food such as bean paste, a method has been known in which a bag made of a plastic film is filled and the inlet is closed by a metal ring. There is.

[0003]

In order to open the package obtained by the above method, a method of cutting the plastic film with a kitchen knife to take out the contents is taken, but since the kitchen knife comes into contact with it, it is hygienic. It is not preferable from the aspect.
A first object of the present invention is to provide a package of paste-like food that can be opened without contact with such a kitchen knife, and the contents can be easily opened without concern for hygiene.
A second object is to provide a method of packaging in a possible package .

[0004]

[Means for Solving the Problem] A tubular film having a tear directionality and a heat-shrinkable biaxially stretched nylon film laminated with a heat-sealable plastic film, and a heat-sealed tubular film having the edges thereof butted against each other. A bag, wherein the longitudinal sealing portion of the tubular body is placed at the center of the bag width, and one opening is heat-sealed to form the bottom portion of the bag,
The other opening is the entrance of the container, and the tearing direction of the laminated film is in a bag that is orthogonal to the opening edge of the container entrance, to the extent that paste-like food is not filled. The opening of the contents inlet is heat-sealed in a state in which the air is not substantially left in the bag, and the heat-sealing part corresponding to the bottom of the bag or the contents-inlet part has a longitudinal sealing part. Cuts are provided at two locations at equal intervals from to the main body of the bag, and the heat-sealed portion between the cuts is opened by pulling the heat-sealed portion toward the main body on the side of the vertical seal portion to remove the hot water with hot water. It is achieved by shrinking a laminated film that is dipped in a bag and shrinking the laminated film so that the contained food is packaged while being clamped with the film.

The second object is the invention of claim 3, that is, (a) a heat-shrinkable biaxially stretched nylon film having tear directionality and a heat-sealing property. A laminated film laminated with a plastic film is heat-sealed by forming the heat-sealing plastic film inside and abutting the edges together to form a tubular body, and (b) a longitudinal sealing portion of the tubular body. Is placed in the center of the bag width and one opening is heat-sealed to be the bottom, and the other opening is used as the inlet of the contained object, and the tearing direction of the laminated film of the tubular body is the opening of the contained object inlet. A bag is formed so as to be orthogonal to the edge portion, and (c) the bag is filled with paste-like food so that the bag does not substantially fill the bag with air, and the air is not substantially left in the bag. Heat seal the opening of (d) above bag In a heat seal portion strikes the bottom or contained goods inlet part, the longitudinal sealing portion at equal intervals of two positions,
A notch is provided toward the main body of the bag, and the heat-sealed portion between the notches is pulled in the direction of the main body on the longitudinal seal portion side to open the bag. (E) The food container is dipped in hot water to form a bag. By shrinking the laminated film forming the, the food contained is in a state of being tightened with the film (a) ~ (e) by a packaging method of a paste-like food consisting of sequentially performing each operation To be achieved.

As the nylon forming the bag used in the package of the present invention, an aliphatic polyamide such as nylon 6, nylon 6-6, nylon 4-6; an alicyclic polyamide having a cyclohexane ring, an aliphatic diamine, etc. Polyamide obtained by polycondensing a nylon salt of terephthalic acid and / or isophthalic acid, or a nylon salt of xylylenediamine and an aliphatic dicarboxylic acid; a monomer for these homopolyamides and a nylon salt are combined. Examples thereof include copolyamides obtained by polymerizing together; or a mixture of these polyamides, and a polyamide-based resin made of a mixture of these polyamides and a thermoplastic resin blendable therewith.

In order to obtain a heat-shrinkable film from the above-mentioned nylon, an unstretched film made of the above material is stretched in the longitudinal and transverse directions at a desired ratio and then heat-set at room temperature. It is sufficient to impart dimensional stability and retain heat shrinkability.

When an unstretched film is stretched, a nylon film has a tear direction in the stretching direction. That is, when the film is torn in the stretching direction, it is torn in that direction with a relatively small force. For example, if the film is stretched only in the machine direction, tear directionality occurs in that direction, and if it is stretched in two machine directions, tear directionality occurs in both directions. Therefore, as described above, when the unstretched film is stretched and heat-set in order to impart heat shrinkability and dimensional stability at room temperature, tear directionality is simultaneously imparted.

Since the nylon film having tearing directionality and heat shrinkability obtained as described above is formed into a bag by heat sealing, a heat-sealing plastic film such as low Films made of high density polyethylene, linear low density polyethylene, medium density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, etc. are laminated. Specifically, nylon film, low density polyethylene film,
Further, it is preferable that a linear low-density polyethylene film is further laminated thereon.

The nylon film used in the packaging bag of the present invention obtained as described above has a shrinkage ratio in the longitudinal and transverse directions of 10 to 30%, which is excellent in heat sealability. In the case where the plastic films are laminated, the shrinkage ratios in the longitudinal direction and the transverse direction are both 5 to 2
It is preferably within the range of 0%, and it is preferable that the shrinkage rate is the same in both directions.

To make a bag from the heat-shrinkable nylon film, the film is laminated so that the surface on which the heat-sealable film is laminated is inside, and the film is rolled so as to form a tubular shape, and the edges are butted against each other. Seal it (paste on the palm) and make a cylindrical body. Longitudinal sealing part of this tubular body
The (gassho sticking part) is placed in the center of the bag width, and one opening is heat-sealed to form the bottom. The other opening is used as the inlet of the contents, and the paste-like food is injected and filled from here, and when a predetermined amount of food is filled, the inlet is heat-sealed so that air does not remain in the bag inlet. , To obtain a paste-like food package. In the heat-sealed portion at the bottom or the inlet of the package thus obtained ,
In two places equal intervals from the sealing portion, provided with a notch towards the body portion of the bag. This notch opens the package.
When sealing, cut the part between the notches in the vertical direction.
Pulling in the direction of the package body on the
The strip-shaped piece centered on the ridge is torn and opened.

When the paste-like food package thus obtained is pressed with a fingertip, the portion thereof is freely recessed and maintains its deformed state. For example, the one filled with bean paste cannot be put in the bag. If you press only the bean paste with your finger, the part will dent, but the one filled in the above bag will behave in exactly the same way and is not necessarily preferable as a product. . In the present invention, the package obtained as described above is dipped in hot water (80 to 100 ° C.) and varies depending on the size of the package, but usually 0.5 minutes or more, preferably 3 Heat for 30 minutes to shrink the heat-shrinkable nylon film that constitutes the bag.

Due to the shrinkage of the nylon film, the food in the contents is in a tightened state, and when the fingertip is pushed from the outside of the bag, it is somewhat dented, but when the finger is removed, the food has a tension so that it returns to its original shape. Will be things. Such a material does not deform even if a large number of such materials are stacked. In this package, the nylon film of the bag is biaxially stretched in the longitudinal and transverse directions, and tear directionality is given to the heat-sealing edges of the bottom and the entrance of the package in a direction orthogonal to the heat-sealing edges.

The package thus obtained and the mode of opening the package will be described with reference to the accompanying drawings. Figure 1
Is a schematic plan view of an example of the package of the present invention, FIG. 2 is a schematic front view of the package, and FIG. 3 is a schematic perspective view showing the opened state of the package.
FIG. 4 is a schematic plan view of an example of a hot plate of a heat sealer used when manufacturing the package of FIG.

In the figure, 1 is a bag body formed from a biaxially stretched nylon film for packaging a paste-like food,
Since 2 is a bag body manufactured from a nylon film, a heat seal portion in the vertical direction generated when the film is formed into a tubular body, 3 is a heat seal portion at the bottom of the bag body, and 4 is an inlet for the contents of the bag body. In the heat seal parts 3 or 4, projecting heat seal parts at both ends in the width direction of these heat seal parts, and 6 cuts provided in the heat seal part 4 (the cuts are made in the heat seal part 3). 7 may be provided), 7 is a tear piece generated when the package wrapped by the bag body 1 is opened, 8 is a planned line of progress of the tear piece 7, and 9 is a torn piece which is formed by the movement of the tear piece 7. Paste-like food, which is a product, 10 is a heat plate of a heat sealer for forming the heat seal parts 3 and 4, 11 is a part of the heat plate 10, and is a protrusion for forming the protruding heat seal part 5. It is a part.

As shown in FIGS. 1 and 2, the bag body 1 made of a heat-shrinkable nylon film is filled with paste-like food as described above, sealed, and then immersed in hot water. , A package obtained by shrinking a nylon film. In this package, the heat-sealing portions 3 and 4 of the bag are not rectangular, but a projecting heat-sealing portion 5 having a shape that fits inside the bag body is formed as indicated by reference numeral 5 in FIG. . The protruding heat seal portion 5 is obtained by using the heat plate 10 having the shape shown in FIG. 4, that is, the shape having the protruding portion 11 in a heat sealer. (The operation when such a shape is taken will be described later.) Then, the hot plate 10 has parallel ridges as shown in the drawing, and the heat seal parts 3 and 4 in FIGS. The parallel lines are shown as the unevenness caused by the ridges of the hot plate. In addition,
The heat plate of the heat sealer may have a simple rectangular shape, or the surface of the heat plate may be flat. The length of the heat seal 3 or 4 (the length indicated by C in FIG. 1) is 1
The range is not less than cm, preferably 2 to 6 cm.

Next, a method for opening the package shown in FIGS. 1 and 2 will be described. The heat seal portion 4 is provided with notches 6 at two locations, and the outsides of the notches 6 and 6 are pressed so as not to move. For example, place this package on a flat plate, press the outside of the cuts 6 and 6 with two fingers of one hand, and remove the part sandwiched between the cuts 6 and 6 with the fingers of one hand. When pulling the knob, in the direction toward the heat seal 3, in a slightly diagonally upward direction, the nylon film of the bag body 1 has tearing directionality in the direction toward the heat seal part 3, and therefore tears in that direction, When the pulling is continued, tearing is performed like the tearing piece 7 shown in FIG. 3, and when it is further continued, the tearing piece 7 is torn in accordance with the planned traveling line 8 of the tearing piece,
Tear is performed over the entire length of the food storage portion of the bag body 1.

When tearing is performed as described above, the package in the state shown in FIG. 3 is turned over and the content is pushed out from the bag, and the content is discharged. That is, the contents are discharged without touching the contents.

In the heat seal parts 3 and 4 in FIG. 1, the protruding heat seal part 5 is provided because, as described above, the tear piece 7 is torn by pulling and then the package is turned over to discharge the contents. When the heat plate of the heat sealer is a simple rectangle,
At the four corners of the package (namely, at the portions indicated by reference numeral 5), such foods such as bean paste are not completely discharged and remain, but it is preferable to use these portions as projecting heat-sealed portions because the above-mentioned residue does not occur. . Then, when tearing is started and the tear reaches the filling position of the contents, tearing occurs on the upper surface of the bag body 1, which is deteriorated by heat at high temperature during heat sealing. However, it is considered that the strength is slightly decreased.

[0020]

[Example] A nylon 6 film (thickness 15μ) obtained by biaxially stretching 3 times in the longitudinal direction and 3 times in the transverse direction, a low-density polyethylene film having a thickness of 15μ, and a thickness further thereon A laminated film in which 30 μm linear low-density polyethylene films were laminated was used as a material for manufacturing the bag body. The heat shrinkage of this laminated film was 13% in the longitudinal direction and 13% in the lateral direction.

First, the laminated low-density polyethylene film was heat-sealed in the longitudinal direction (temperature: about 175 ° C.) so that the linear low-density polyethylene layer was on the inner surface of the bag and the final shape was as shown in FIG. ), One of the open ends is heat-sealed (temperature: about 185 ° C.) to form the bottom. This is filled with red bean paste, and the filling inlet of the red bean paste is heat-sealed (temperature: about 185 ° C.) in a state where no air remains. Each of the heat seals at the bottom of the bag and the contents inlet was carried out by using a hot plate shown in FIG.

The resulting package is placed in hot water of about 95 ° C. for about 2 minutes.
The nylon film was soaked for 0 minutes to shrink the nylon film to obtain the intended package. Regarding the size of the obtained package, a is 240 mm and b is 110 in terms of the dimension measurement points shown in FIG.
mm, c was 10 mm, d was 20 mm, the circumference of the middle body of the package was 240 mm, and the amount of bean paste stored was 1 kg. As described above, the package was opened by pinching the portion sandwiched by the notches with a fingertip and pulling the package, and the package was discharged without touching the contents with a knife or a hand.

Examples of paste-like foods to which the package of the present invention is applied include miso, sake lees, peanut butter, jelly, cream, curry cooked products for curry rice, etc. in addition to the above-mentioned anko.

[0024]

EFFECTS OF THE INVENTION The paste food sealed in a nylon film can be unsealed and taken out without the need for touching the contents with a knife or hand.

[Brief description of drawings]

FIG. 1 is a schematic plan view of an example of the package of the present invention.

2 is a schematic front view of the package shown in FIG. 1. FIG.

FIG. 3 is a schematic perspective view showing an opened state of the package shown in FIG.

FIG. 4 is a schematic plan view of an example of a hot plate of a heat sealer used when manufacturing the package shown in FIG.

[Explanation of symbols]

1 Bag Main Body 3 Heat Sealing Part 4 at Bottom of Bag Main Body 4 Heat Sealing Part 6 at Entrance of Contents in Bag Main Body 6 Cut 7 Tear Piece Generated When Opening Package 10 Heat Plate of Heat Sealer

   ─────────────────────────────────────────────────── ─── Continued front page       (56) Reference JP-A-57-68326 (JP, A)                 JP 63-317464 (JP, A)                 JP 62-182051 (JP, A)                 JP-A 1-226556 (JP, A)                 Actual Development Sho 55-18478 (JP, U)                 Actual development Sho 63-144447 (JP, U)

Claims (4)

(57) [Claims] 1. A heat-shrinkable biaxial having a tear direction.
A tubular bag heat-sealed by abutting the edges of a laminated film in which a stretched nylon film and a heat-sealable plastic film are laminated, wherein the longitudinal sealing portion of the tubular body is in the center of the bag width. Place, one opening is heat-sealed to form the bottom of the bag, the other opening is the entrance of the contents, and the tearing direction of the laminated film is orthogonal to the opening edge of the contents entrance. The paste-like food is contained in a bag that does not fill the bag, and the opening of the contents inlet is heat-sealed in a state where air is not substantially left in the bag. The heat-sealing portion, which corresponds to the bottom portion of the bag or the inlet portion of the contents, is provided with two notches facing the main body portion of the bag at equal intervals from the longitudinal sealing portion. Shi The food product to be unsealed by pulling in the direction of the main body on the side of the package part is immersed in hot water to shrink the laminated film that forms the bag, and the food product contained is packaged with the film tightened. Naruto paste-like food packaging. 2. The package according to claim 1, wherein the heat-sealing part at the bottom of the bag and the heat-sealing part at the inlet of the contents have projecting heat-sealing parts whose both ends enter the inside of the bag body. . 3. A method for packaging a paste-like food product, which comprises sequentially performing the following (a) to (e). (a) A heat-shrinkable biaxially stretched nylon film having tear directionality and a heat-sealing plastic film are laminated, with the heat-sealing plastic film inside. A heat-sealed tubular body is formed by abutting the edges together, and (b) the longitudinal sealing portion of the tubular body is placed at the center of the bag width, and one opening is heat-sealed to form the bottom portion, and the other An opening is used as an inlet of the contained object, and a tearing direction of the laminated film of the tubular body is formed into a bag that is orthogonal to the opening edge of the contained object inlet, and (c) the bag. The paste-like food is stored to the extent that it does not fill up , and the opening of the container inlet is heat-sealed in a state where air is not substantially left in the bag, and (d) the bottom of the bag or the container inlet is hit. Vertical seal at heat seal At regular intervals of two places from,
A notch is provided toward the main body of the bag, and the heat-sealed portion between the notches is pulled in the direction of the main body on the longitudinal seal portion side to open the bag. (E) The food container is dipped in hot water to form a bag. The laminated film forming the film is contracted so that the food contained therein is tightened with the film. 4. The heat seal at the bottom of the bag and the heat seal at the inlet of the contents are characterized in that both ends of the heat seal have projecting heat seals that are inserted into the inside of the bag body. 3. The packaging method described in 3.