JPH05193671A - Packaging material for bar-like food - Google Patents

Abstract

PURPOSE:To tear a bar-like food packaging material having synthetic resin film as the base material accurately along a predetermined unpacking line and impart an assured gas-barrier function to the packaging material. CONSTITUTION:One or more perforations 2 are formed in the base film 1 consisting of synthetic resin in the form of an oblique line, obliquely intersecting lines, a perpendicular line, a parallel line or a curved line relative to the longitudinal direction of a bar-like food and, on one side of the base film 1, an extrusion coat layer 3 is formed by applying a resin extrusion coat thereto to fill up the perforations. Polyvinylidene chloride resin coats 4 and 5 are applied to the surfaces of the extrusion coat layer and the base film, respectively, to impart the packaging material gas-barrier and high frequency sealing functions and make its unpacking easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stick (bar)
In packaging of sausages and cheeses, the present invention relates to a rod-shaped food packaging material that can be easily opened and taken out.

[0002]

2. Description of the Related Art Conventionally, for packaging sausages and cheeses, a method has been widely used in which a polyvinylidene chloride film is used to seal the longitudinal body portion in an envelope with high frequency and the top and bottom are ligated with a metal wire. The product is supplied to the market in large quantities, and is sometimes used for school meals. Considering the nutrition of the people, it is a very important food that is frequently used.

However, this product is extremely difficult to open without the use of a knife, and it is not easy to take out the contents. Some products of this type have a width of 3 mm over the entire length in the longitudinal direction on the body of stick-shaped products.
A tape-shaped film (commonly called a cut tape) on the front and back is high-frequency-bonded, and when this tape is pulled, the packaging film of the main body of the product is torn and the invention is invented so that it can be easily opened.

However, in attempting this, there are many cases in which only the tape is peeled off and the packaging film is not torn, or only a part is torn, and the torn portion is in close contact with the contents, so that the film is removed. It is difficult to peel and it cannot be said that opening and taking out the contents have become easy enough.

Except for the above-mentioned cut tape method, as a method of opening sausage or cheese packaging, the packaging is cut with a knife or the metal wire is used to tear off the film, and then the packaging is broken with your fingertips. Most of the methods are to squeeze out the contents with your hands or teeth. However, since these sausages and cheeses are often given as snacks for infants and school children, it is dangerous to use knives, and the knives are not always at hand. Therefore, an unsealing method of cutting off the film together with the metal wire is generally widely used, but this method is not preferable for the following reasons.

[0006]

That is, the metal must be held in the mouth, and it is difficult to swallow it. In addition, it is difficult to say that the area around the ligated metal is in good hygiene. This packaging form has been implemented without improvement for more than 20 years. For example, a packaging-related magazine, for example, monthly magazine “FOOD PACKAGING” published by The Daily Report, September 59, 1986, p. 59. It states that requests for improvement regarding these are being discussed at the consumer roundtable.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a stick-shaped food packaging material for stick-shaped sausage or cheese packaging, which can be easily opened and taken out. Is to

[0008]

The rod-shaped food packaging material of the present invention will be described with reference to FIG. 1. A base film 1 made of a synthetic resin film is formed in a diagonal direction with respect to the longitudinal direction of the rod-shaped product. An extruded coat layer formed by extruding a resin for closing the perforations 2 on one surface of the base film 1 by providing one or a plurality of perforations 2 in a diagonal cross direction, a right angle direction, a parallel direction, or a curved line. 3 is provided, and polyvinylidene chloride resin coat layers 4 and 5 for gas barrier property, high frequency sealing property and ease of opening are formed on the surface of the extrusion coat layer 3 and the substrate film 1. I am trying. 6 is a printing unit.

The rod-shaped food is packaged with the polyvinylidene chloride resin coating layer 5 inside the packaging material constructed as described above.

[0010]

[Function] Since the perforation 2 having an easy-to-open shape is provided at the position where the base film 1 is easily opened, the perforation 2 can be easily opened by bending and the perforation 2 is closed by the extrusion coat layer 3. After that, since both sides of the film are coated with a polyvinylidene chloride resin (hereinafter sometimes referred to as PVDC), a gas barrier function and a high frequency sealing suitability are imparted.

[0011]

EXAMPLES Examples of the present invention will be described in detail below. Since there is a difference in the method of manufacturing products between sausage and cheese, there is a difference in material between the packaging materials. But the basic method is similar. The present invention will be described in detail in the order of sausage packaging material and then cheese packaging material.

FIG. 2 shows an example of the packaging material structure of the present invention for sausage packaging material. That is, PVDC
Coat layer 5 / Heat seal type stretched polypropylene film 1a / Printing part 6 / Extruded polypropylene coat layer 3a / PVDC coat layer 4 The manufacturing process of the above packaging material is as shown in FIG.

(1) Stretched polypropylene film 1a
The (base film) is printed.

(2) Perforations are provided at predetermined positions for printing. That is, when a product is made, a perforation is made at a place most suitable for opening and the product is printed and displayed. However, in the actual packaging material manufacturing process, after printing, a perforation is made in accordance with the printing.

(3) The film perforated in (2) is extrusion-coated with polypropylene.

(4) PVDC on both sides of the sheet of (3)
Coat and age.

(5) The sheet of (4) is slitter finished to a required width and supplied in roll form.

The configuration shown in FIGS. 2 and 3 will be described below.

In the manufacturing method currently used, a method of sealing a polyvinylidene chloride film at a high frequency is adopted. Sausage requires a packaging material with a high gas barrier property, and there is a heat sterilization process of 100 ° C or higher in the manufacturing process of the product, and polyvinylidene chloride film is adopted as a material that satisfies this gas barrier property, hot water resistance, etc. ing. As a sealing method, a high frequency sealing method suitable for a polyvinylidene chloride film is used. On the other hand, this type of packaging line is installed in each sausage and cheese maker, and the number of facilities is estimated to be enormous. Also in the present invention, polyvinylidene chloride coating is applied to both sides of the existing equipment effectively and with consideration not to change the production process and distribution of sausage.

By the way, since the synthetic resin film generally has a high tear strength and also has extensibility, it is very difficult to tear or tear it by hand. One of the methods to facilitate opening after packaging is to scratch the film, but the current packaging form of sausage and cheese and the packaging material composition satisfy both gas barrier property and easy opening property. It has not been completed to add a cutting method that allows it.

The packaging material currently used has the following structure.
It is a polyvinylidene chloride film / printing / adhesive / polyvinylidene chloride film (there may be no printing), and if the polyvinylidene chloride film in the inner and outer layers is scratched, the gas barrier property will be impaired, and the outer layer Alternatively, even if only one of the inner layers is scratched, the polyvinylidene chloride film which is not scratched has a high tear strength and cannot be broken.

Therefore, in the present invention, the packaging material for cheese and sausage is devised as follows. In order to add the required two major functions, that is, the opening function and the gas barrier function, we decided to make a composite packaging material, and during the manufacturing process, first add the opening function and then do not impair the opening property. It was decided to add a gas barrier function.

The following is a description along the above-mentioned embodiment.
The polypropylene film is scratched (perforations with a shape that is easy to open are provided at easy-to-open positions) to impart an opening function, and the perforations are closed by extrusion coating of polypropylene, and then polyvinylidene chloride resin is applied to both sides of the film. It was decided to provide a gas barrier function and high-frequency sealing suitability by coating the above. Here, the reason why vinylidene chloride is used as a coat regardless of the film is that the polyvinylidene chloride film has too much strength and cannot be broken even if combined with a perforated film.
This is because the coating film of polyvinylidene chloride resin can be easily broken. This is because the coating thickness of the polyvinylidene chloride resin is as thin as about several μm and the crystallinity is increased by aging after the coating process, so that it is relatively easy to break.

However, coating a perforated film may cause pinholes and insufficient barrier properties, so
As described above, after the perforations are opened, the polypropylene resin is extrusion-coated to close the perforations, and then the polyvinylidene chloride coat is applied. The extrusion coating of polypropylene is used here for the following reasons. That is, it is possible to block perforations with an extrusion coat of polyethylene, but at present, after packaging the contents with a film during the sausage manufacturing process,
There is a step of sterilizing at a temperature of about ℃ to 120 ℃. Polyethylene undergoes severe thermal deformation at temperatures of 110 to 120 ° C. and cannot withstand use, but as a result of testing extrusion coatings of various resins that are commonly used at present, polypropylene extrusion coatings can withstand this temperature and It turned out to be a good packaging appearance.

The reason that polypropylene is used as an extrusion coat instead of sticking films is that the polypropylene film composite has too high a packaging material strength to be broken by hand. Because it is easy to break by hand.

Next, the heat-sealed stretched polypropylene film is used as the base film for perforating for the following reasons. Although it is necessary to apply a polypropylene extrusion coat to close the perforations, this polypropylene extrusion coat can only be applied to polypropylene films. Moreover, by extrusion coating on a usual stretched polypropylene film, it is not possible to obtain the necessary adhesion strength, so in the present invention it is possible to coat the heat-sealed surface of the stretched polypropylene film of the coextrusion heat-sealable type by extrusion coating. did. As a result, the adhesive strength necessary and sufficient for sausage or cheese stick packaging could be provided.

Although the above is one specific example, the object of the present invention is to provide various characteristics that have been conventionally required in packaging sausages and cheeses, namely, suitability for a filling machine, heat resistance, gas barrier property, and the like. The material used as the packaging material is not limited to the heat-sealing type stretched polypropylene or the polypropylene extrusion coat as long as it is to impart the unsealing property to the material. A combination of extrusion of polyamide-based film and polyamide-based resin, extrusion of polyethylene terephthalate-based film and similar-type resin, further mixing of various resins such as olefin-based resin, polypinyl alcohol-based resin, polyvinylidene chloride-based resin, etc. It may be a combination of resins of different systems and different systems. This is because selection of materials should be decided based on economic criteria, product appearance, function, etc., as these will change with the times.
If a polyvinylidene chloride film or a polyvinyl chloride film is used as the base film, the polyvinylidene chloride coat after closing the perforations can be done on only one side.

Next, the position and shape of the perforations will be described in detail. First, as the direction of the perforation 2, as shown in FIGS. 4 to 12, obliquely, laterally, with respect to the longitudinal direction of the rod-shaped product 7,
There are verticals, curves and composites of these. The perforation has a simple shape and a complicated shape. This perforation position,
Since there are differences in the opening method and the function required of the filling machine depending on the direction and shape, they will be described in order below.

First, when one or a plurality of perforations are inserted in a direction oblique to the longitudinal direction of the product, the perforations 2 run around the rod-shaped product 7 as shown in FIGS. 13 and 14.

FIG. 13 is a front view of the bar-shaped product 7, FIG.
Shows the rear view, and the perforations that can be seen are shown by solid lines, and the perforations that cannot be seen by turning to the back are shown by broken lines.
8 is a back pasting part.

The perforation does not have to be one or a plurality of continuous lines (helix-like shape) with respect to the product, but is one or a plurality of diagonal lines interrupted by the back attaching portion 8. This product is twisted in the direction opposite to the running direction of the perforations.
Then, the packaging material easily tears (rips) along the perforations. At this time, since the packaging material is released from the close contact state with the contents and floats up, it is easy to open the packaging material as a clue. If the angle between the direction of the perforations and the longitudinal direction of the product is in the range of 20 ° to 70 °, the packaging material can be easily broken without breaking the contents. However, this suitability angle is for the purpose of breaking, that is, the number of perforations required and the opening start position is limited or arbitrary, or the opening start position is singular or plural, and the product diameter Etc. For example, in the case of a product having a diameter of 10 to 30 mm and the perforation having an angle of 70 ° is located at a position of 5 to 20 mm from the head (or the bottom), the opening method is as follows.

When the head of the product is lightly pinched with fingers and a force is applied to fold it toward the back sticking part, the perforations are torn and the product shown in FIG.
As shown in FIG. 5, the inside head is exposed. When the pinched packaging material is further pulled down along the spine pasting portion 8, as shown in FIG. 16, the packaging material can be cut in a tape shape along the sealing line of the packaging material with a width corresponding to the seal width, The entire contents can be exposed. And, this is the most preferable situation of opening and taking out the contents, but the condition is that the perforation is located at a position of 5 to 20 mm from the head. However, at present, sausage and cheese are filled and packaged by the endless method without the mark alignment. Therefore, in order to keep the perforation at a position 5 to 20 mm from the head like this, , The number of perforations is required to be plural. On the contrary, taking out the product is the same as in the past, and if it is only necessary to easily open the product, if the angle is made small, even if the number of perforations is reduced, there are perforations at any position in the longitudinal direction of the product. The packaging material can be torn at the twisted position.

Next, as shown in FIG. 7, when the rod-shaped product 7 is inserted so that the perforations 2 in the diagonal direction cross with the longitudinal direction as the axis of symmetry, the product can be twisted in either the left or right direction. , You can break either of the two symmetrical perforations. The cross perforation is very convenient because you do not have to worry about the twisting direction.

A case will be described in which perforations as shown in FIG. 17 are inserted in a curved line to form a bar-shaped product 7 as shown in FIGS. 11 and 12. 11 shows a front view and FIG. 12 shows a rear view. The perforations 2 shown in FIG. 17 are intended to break the film according to a line planned in advance. Generally, plastic films are easily torn when scratched, and in the present invention, this property is used to make a perforation, but if the distance is a straight line and a short distance of several centimeters, Even if it is torn, if it is a broken line, a curve, or a straight line with a length of 10 cm or more, it is very difficult for the simple perforation to break as intended (perforation). This is because many plastic films have the property of tearing in the direction in which force is applied.

When attempting to break the film into a desired polygonal line or curved line, the force applied must act exactly in the direction of that line. However, in reality, it is difficult to apply an accurate force in the necessary direction due to slack of the film, slight shaking of the hand, etc. In fact, most of the time, the cutting line deviates in an unexpected direction. However, by using a modified perforation as shown in FIG. 17, it is possible to surely cut a polygonal line or a curved line as planned. According to FIG. 17, when the film is cut in a curved shape from (a) to (b), if the left and right of the point (a) are pinched with fingers and a normal breaking action is applied, the film may be broken in a curved shape without failure. I can.

An enlarged view of this perforation is shown in FIG.
In the figure, (c)-(d), (e)-(f) have the film cut beforehand, so the actual action of tearing is (d)
It means breaking from the point to either (e)-(f) or (t)-(h) line. Here, from (d) onward, the tear breaks in the direction in which the force is applied by accident, and it is difficult to control that force, so the tear cannot be aimed at a specific point. However, in the case of the perforations shown in FIGS. 17 and 18, if the breakage is within the angle A formed by (d)-(ri) and (d)-(nu), the next break is (f) or ( H) It would be good to start with. In other words, it becomes possible to allow the breaking direction. The probability of success in the case of breaking as intended differs naturally between the case where only one point of breaking is allowed and the case where it is within a certain range. 19 and 20 are figures of a modified sewing machine based on the same idea. In either case, even if there is blurring in the breaking direction, the next perforation is always waiting ahead of that, and the direction can be controlled as a whole.

A modified perforation having such a property is shown in FIG.
1. When applied to sausage or cheese packaging in the form shown in FIG. 12, the head is exposed and the packaging material is tape-shaped along the spine sticking portion, as described in the diagonal perforation. It can be easily cut into pieces to expose the entire contents. At this time, if the perforations are arranged so that the cutting direction becomes a curve at the points of (ru) (wo) (wa), (wo),
It is possible to smoothly change the direction from the horizontal tear that has progressed to (wa) to the vertical tear that reaches the bottom. However, this perforation requires the point (L) in FIG. 11 to be located 5 to 20 mm from the head of the product.
It is necessary for the user to modify the existing filling and packaging machine to the mark alignment method.

When a perforation is formed in a direction perpendicular to the longitudinal direction of the product, the perforation is positioned 5 to 20 mm from the head, and the head packaging material is pinched with the fingertips and folded down to the back sticking portion side. The same opening operation as described above facilitates opening and taking out the contents. However, in order to always have a perforation at a position of 5 to 20 mm from the head, mark filling is performed or perforations are provided at a pitch of 20 mm (for example, if the product length is 200 mm, it is shown in FIG. 9). It is necessary to provide 9 perforations).

Further, as shown in FIG. 21, when perforations 2 parallel to the longitudinal direction of the rod-shaped product 7 are inserted, the perforations are broken by bending the product. It can be taken out. Further, in this case, since the perforations are always provided over the entire length of the product, it is not necessary to align the marks at the time of filling and packaging.

As described above, any of the perforation lines including the oblique perforation line, the oblique cross perforation line, the modified perforation line, the horizontal perforation line and the parallel perforation line with respect to the longitudinal direction of the product. It is easy to open. Which line to use depends on the design, equipment, productivity, and product characteristics (for example, a child is a reference product, and it is necessary to make it easy to open, or it is necessary to take out the whole form without damaging the contents. Should be taken into consideration when making decisions.

Next, in the case of cheese, there is no step of heat sterilization after filling and packaging cheese. Therefore, as in the case of the sausage described above, the resin that closes the perforations does not have to be polypropylene, but may be a resin such as polyethylene. As the base material to be perforated, various resin films such as polyester, cellophane, nylon and polyvinyl alcohol film can be used. For perforations, the same method as sausages can be used for easy opening and easy removal of the contents.

[0042]

As described above, when the stick-shaped food packaging material according to the present invention is applied to cheese or sausages, it is easy to open with a finger without using a knife or a tooth. It can be done cleanly and the contents can be taken out easily.
It is also a great advantage that the coating of PVDC reduces the permeability of oxygen gas to 1/3 or less of the conventional packaging material.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory diagram showing the basic configuration of the present invention.

FIG. 2 is a cross-sectional explanatory view of a packaging material in an example.

FIG. 3 is an explanatory view showing a manufacturing process of the packaging material.

FIG. 4 is an explanatory view showing the shape of perforations.

FIG. 5 is an explanatory diagram showing the shape of perforations.

FIG. 6 is an explanatory diagram showing the shape of perforations.

FIG. 7 is an explanatory diagram showing the shape of perforations.

FIG. 8 is an explanatory diagram showing the shape of perforations.

FIG. 9 is an explanatory diagram showing the shape of perforations.

FIG. 10 is an explanatory diagram showing the shape of perforations.

FIG. 11 is an explanatory diagram showing the shape of perforations.

FIG. 12 is an explanatory diagram showing the shape of perforations.

FIG. 13 is an explanatory diagram showing the shape of perforations.

FIG. 14 is an explanatory diagram showing the shape of perforations.

FIG. 15 is an explanatory diagram showing the shape of perforations.

FIG. 16 is an explanatory diagram showing the shape of perforations.

FIG. 17 is an explanatory diagram showing the shape of perforations.

FIG. 18 is an explanatory diagram showing the shape of perforations.

FIG. 19 is an explanatory diagram showing the shape of perforations.

FIG. 20 is an explanatory diagram showing the shape of perforations.

FIG. 21 is an explanatory diagram showing the shape of perforations.

[Explanation of symbols]

 1 ... Substrate film 1a ... Stretched polypropylene film 2 ... Perforation 3 ... Extrusion coating layer 3a ... Extrusion polypropylene coating layer 4, 5 ... Polyvinylidene chloride coating layer 6 ... Printing part 7 ... Rod-shaped product 8 ... Back part

Claims (1)

[Claims] 1. A base film made of a synthetic resin film is provided with diagonal perforations, oblique cross directions, right angles, parallel directions or curved perforations with respect to the longitudinal direction of a rod-shaped product.
Provide a book or a plurality, provided on one surface of the base film, an extrusion coat layer by extrusion coating of a resin for closing perforations, on the surface of the extrusion coat layer and the base film, gas barrier properties, high-frequency sealability and A stick-shaped packaging material for foods, which is formed by forming a polyvinylidene chloride resin coating layer for easy opening.