JPH0231412Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] The present invention relates to a shrink wrapper for wrapping processed meat products, etc. using a heat-shrinkable film, and particularly relates to a shrink wrapper in which a product display such as a trademark is provided on the film. .

[Technical background and conventional technology]

Smoked products such as grilled pork shown in Figure 6 and
Processed meat products such as sausages and ham shown in the figure are
Recently, many items have been shrink-wrapped using a heat-shrinkable packaging film 2. In the case of packaging processed meat products, as packaging film 2,
Those having excellent barrier properties and high heat shrinkage are preferably used, such as a multilayer film of polyvinylidene chloride and polyolefin, or a multilayer film of saponified ethylene and vinyl acetate copolymer and polyolefin. This type of packaging process involves vacuum packaging the contents 1 inside a packaging film 2, and then heating the film 2 by immersing it in a hot water bath or placing it in a heating chamber using a hot water shower or hot air, thereby causing the film 2 to shrink. There is. In the completed shrink package, the film 2 shrinks due to heat,
The feature is that it fits the outer shape of the contents 1. This kind of transparent, tight-fitting packaging improves the appearance of the product, so in recent years, many shrink-wrapped meat products, especially smoked products such as grilled pork, have been sold on the market. It's starting to look like this.

[Problems with conventional technology]

Heat shrink film 2 as shown in Figures 6 and 7
It is common for a shrink wrap using a product to have a product indication 3 such as a trademark on the surface of the package. Conventionally, the packaging film 2 is manufactured by printing a product display 3 on the surface of the film 2. Then, the contents 1 are packaged using the printed packaging film 2, and the printed portion of the product display 3 is also shrunk along with the film 2 through a heat shrinking process. However,
For example, when a multilayer film of polyvinylidene chloride and polyolefin with a heat shrinkage rate of around 40% at 100°C is used as the packaging film 2,
After heating and shrinking, the portion of the film 2 that is in close contact with the contents 1 shrinks by a predetermined amount, for example, 10 to 20, depending on the margin due to the dimensional difference with the contents 1.
% shrinkage. Of course, the film 2 is not limited to this ratio due to the relationship with the content 1, and the film 2 will come into close contact with the content 1. Therefore, at this time, the part of the product display 3 printed on the surface of the film 2 also shrinks at the same rate or at a rate close to this. Therefore, problems such as distortion of the image on the product display 3 occur in the completed shrink wrap. In particular, in the case of irregularly shaped items such as grilled pork shown in Fig. 6, the degree of shrinkage differs depending on the part, so the distortion of the product display 3 becomes even greater depending on the unevenness of the amount of shrinkage, and the appearance of the part of the product display 3 becomes defective. Prone. Moreover, if the amount of shrinkage of the printed part of the product display 3 is large, the ink will lose its luster. Furthermore, in the heat shrinking process after packaging the contents 1, the ink used to print the product label 3 is soaked directly in a bath of water, so the ink itself must have good heat resistance, which reduces printing costs. It gets expensive.
Furthermore, when using the packaging film 2 that has a large amount of heat shrinkage as described above, the printed portion often becomes distorted during the printing process, and the dimensional stability of the film itself may be poor. It also has the disadvantage of causing many printing defects.

The technique of directly printing the product display 3 on the packaging film 2 has various problems as described above. Other display methods to avoid these problems include:
The product display 3 is also printed on a label that does not have heat shrinkability, such as paper, and is adhered to the surface of the film 2 after the shrinkage process is completed. However, in the case of an irregularly shaped product such as a smoked product, the label cannot completely fit the outer shape of the content 1. As a result, the adhesive strength of the label becomes weaker, causing problems such as easy peeling. Furthermore, even if the shape of the contents is not complicated, if moisture or oil adheres to the surface of the packaging film 1, there is still the problem that the label will not adhere sufficiently.

[Purpose of invention]

The present invention was developed by focusing on the above-mentioned conventional problems, and allows the product display to be completely fitted onto the shrunken film, while minimizing distortion of the print, and maintaining the gloss of the printed area, improving the appearance of the product display. It is an object of the present invention to provide a shrink wrapper which can improve packaging quality even when packaging irregularly shaped contents.

[Structure of the idea]

The shrink wrapper of the present invention has contents tightly wrapped in a heat-shrinkable film, and the shrink wrapper has a product label on the surface of the film, and the temperature is the same as that of the packaging film. A label body is formed by overlapping multiple sheets of film material with a low heat shrinkage rate, and printing the product indication on the overlapping surface of the film materials, and this label body is attached to the surface of the packaging film. The packaging film is characterized in that it is heat-shrinked together with the packaging film in the wrapped state.

In this invention, the label body is constructed using a label material made of a film material that has a lower heat shrinkage rate than the packaging film, so when the packaging film is shrunk in the heating process of packaging work, the label material is also wrapped in the packaging. It will shrink due to heat, although it will not be as severe as a commercial film. In this case, since the amount of shrinkage of the label material itself is not so large, the image is not distorted, and the printing quality is considerably better without being degraded as much as in the past. Moreover, the difference in the relative amount of shrinkage between the packaging film and the label material is smaller than the absolute amount of shrinkage of the packaging film, so the label material may become misaligned with the packaging film.
Good product display can be formed without the label material peeling off. Furthermore, since a plurality of label materials are overlapped and printing is applied to the overlapping surfaces, the printed portions can be seen clearly through the label materials.

Hereinafter, the structure and operation of the present invention will be explained in detail with reference to the drawings of FIGS. 1 to 5.

Fig. 1 is a perspective view showing the packaging film and label body before the packaging process, Fig. 2 is a perspective view showing the shrink package in a completed state after the film and label body have shrunk, and Fig. 3 is the label body. FIG. 4A and FIG. 4B are cross-sectional views of the label material constituting the label body, and FIG. 5 is a process diagram of the packaging operation.

Reference numeral 11 in the figure is a packaging film. This packaging film 11 is made of a biaxially stretched resin material with a high heat shrinkage rate, for example, one having a high shrinkage rate of about 40% to 50% at about 100°C. When the contents 20 are packaged with this packaging film 11 and heat-treated, the packaging film 11 comes into close contact with the contents 20. The amount of heat shrinkage of the packaging film 11 differs depending on the margin ratio of the film according to the dimensional difference with the contents 20 before shrinkage, but the amount of heat shrinkage of the packaging film 11 is smaller than that of the film alone, and the contents 20 are It will stick to the outside surface. In addition, particularly when packaging processed meat products or processed dairy products, it is common to use a packaging film 11 that has a low moisture permeability and low oxygen permeability, so-called excellent barrier properties.

Specific examples of the packaging film 11 include a multilayer film of polyvinylidene chloride and polyolefin;
There are multilayer films of nylon and polyolefin, or multilayer films of saponified copolymers of ethylene and vinyl acetate, nylon and polyolefins, or multilayer films of saponified copolymers of ethylene and vinyl acetate and polyolefins. . In addition, a single layer film of polyvinylidene chloride or the like may be used. Furthermore, if films made of other materials having the same properties are developed, they can all be used.

Reference numeral 12 is a label body. This label body 12
As shown in FIG. 3, two label materials 12a are
and 12b are bonded together. The label materials 12a and 12b used have a lower heat shrinkage rate than the packaging film 11 at the same temperature. Label material 12a,
The ideal ratio of the relationship between the shrinkage rate of the packaging film 12b and the shrinkage rate of the packaging film 11 varies depending on various conditions. In other words, the actual amount of shrinkage of the packaging film 11 after packaging is the difference between the packaging film 11 and the contents 2.
It varies depending on the film margin ratio based on the dimensional difference from 0. Therefore, it is true that the ideal shrinkage rates of the label materials 12a and 12b differ slightly depending on the substantial amount of shrinkage of the packaging film 11 after heat shrinkage. Furthermore, it is also necessary to consider the relationship with the thermal shrinkage stress of the packaging film 11. That is,
Even if the packaging film has the same heat shrinkage rate at a given temperature, the heat shrinkage stress will differ depending on the material.Due to this difference in heat shrinkage stress, the stress generated on the adhesive surface with the label body 12 will be different. This is because there is a difference. However, when the label body 12 is constructed using label materials 12a and 12b having a lower heat shrinkage rate than the absolute heat shrinkage rate of the packaging film 11,
The packaging film 1 is attached to the packaging film 11.
When heat-shrinking together with 1, there will be some quality differences such as misalignment of the attached part after shrinkage due to the difference in the combination of shrinkage rates, but overall the quality is higher than that of conventional labels. It is certain that a labeled body of The ideal thermal shrinkage rate of the actual label materials 12a, 12b is about 10% at the heating temperature. In some cases, about 5% or less may be ideal.

Specific examples of the label materials 12a and 12b include:
These include shrink polypropylene film, film made by laminating shrink nylon and shrink polyethylene, shrink nylon single film, shrink linear low-density polyethylene (LLDPE), and shrink vinyl chloride film. Of course, if it is a shrinkable film,
It is not limited to the above.

Product display is printed A on the label material 12a on one side.
will be applied. This printing A is label material 12a and 1
It is applied to the overlapping surface with 2b. Then, the print A is sandwiched between the two label materials 12a and 12b, and both label materials 12a and 12b are adhered by the adhesive 14b. An adhesive 14a is also applied to the lower surface of the lower label material 12a, and a release paper 13a is attached with the adhesive 14a sandwiched therebetween. The types of adhesives 14a and 14b are not limited as long as they have excellent water resistance and heat resistance and can withstand boiling or retorting processes. In addition, label materials 12a and 1
2b is transparent so that the printing A can be seen through the upper label material 12b. In addition, when performing printing A, first print white on the lower label material 12a, and then print the product display on top of that, so that the colors that make up the product display will be vivid, and the packaging will be completed. In this state, the color cloudiness due to the ground color of the contents 20 does not occur. In addition, the lower label material 12a
The same effect can be obtained by using a film with a white background.

Next, the manufacturing process of the label body, the adhesion process of the label body, and the packaging process will be explained with reference to FIGS. 4A, 4B, and 5.

First, the label manufacturing process will be explained.

One of the label materials 12a used is one stuck on a release paper 13a via an adhesive 14a (FIG. 4A). Similarly, the other label material 12
b is also bonded onto a release paper 13b via an adhesive 14b (FIG. 4B). Both label materials 12a and 12b are made of the same material and have the same shape. That is, the same ones are used in FIGS. 4A and 4B. Then, a product display is printed A on one side of the label material 12a. This printing A is continuously performed on a plurality of label materials 12a attached to a release paper 13a. At this time, the release paper 13a functions as a backing paper, so that clear and error-free printing can be performed on the label material 12a made of a shrinkable film. After the product display is printed A on the label material 12a shown in FIG. 4A, the label material 12b shown in FIG. Paste it through. As a result, a sandwich-shaped label body 12 as shown in FIG. 3 is formed on the release paper 13a.

On the other hand, the packaging film 11 includes a bottom seal,
The bag is formed into the bag shape shown in FIG. 1 using normal bag making means such as side seals or center seals. The label body 12 shown in FIG.
The film 3a is sequentially peeled off and attached to the surface of the packaging film 11. Thereafter, an amorphous content 20 such as a processed meat product is supplied into the packaging film 11. The internal air is sucked out by a so-called vacuum packaging machine, the packaging film 11 is cut to an appropriate length, and the cut portion is sealed to complete the vacuum packaging. The vacuum packaged product is then heated. This step is carried out by being transported to a hot water tank or a heating chamber using a hot water shower, hot air, or the like. In the heating process, approximately 80
The packaging film 11 is heated at a temperature of about 100 DEG C. and is sufficiently shrunk to fit the shape of the contents 13.

This heating process also causes the label body 12 to shrink. Label material 12 making up the label body 12
The heat shrinkage rates of a and 12b are smaller than that of the packaging film 11. Therefore, the label body 12 will shrink by a smaller amount than the shrinking packaging film 11, and the amount of shrinkage of the printed portion A applied inside the label body 12 will be small, and the pattern will be Distortion and the like are less likely to occur. Also, a packaging film 11 and a label body 1
The relative shrinkage amount between packaging film 1 and
Since the amount of shrinkage is smaller than the actual amount of shrinkage of the packaging film 11, even if the packaging film 11 shrinks, it remains firmly attached to the packaging film 11, and there is no need to worry about it peeling off.

As described above, regarding the adhesion and heat shrinkage of the label body 12, the heat shrinkage stress of the packaging film 11 has a great influence on the stress generated on the adhesion surface and the displacement of the adhesion surface. In order to properly fix the heat-shrinkable label body 12 as in the present invention, the heat-shrinkage stress of the material of the packaging film 11 itself must be 80 g/mm ²
The ideal value is preferably 50 g/mm ² or less.
Packaging film 1 with heat shrinkage stress greater than this
In No. 1, the label quality is slightly deteriorated, such as the label body 12 being prone to wrinkles.

[Example of idea]

Here, packaging film 11 and label material 12 are used.
Examples according to conditions such as specific combinations of the heat shrinkage rates of a and 12b, the heat shrinkage stress of the packaging film 11, and heating temperature will be described below.

(Example 1) The film margin ratio (value expressed as a percentage of the difference between the surface area of the contents 20 and the surface area of the packaging film 11) of the packaging film 11 was 20%. The absolute thermal shrinkage rate of the packaging film 11 at 90°C is 41 in the vertical direction.
%, horizontal 47%. The heat shrinkage stress (shrinkage load per cross-sectional area of the film) at this time was 40 g/mm ² in the vertical direction and 25 g/mm in the horizontal direction.
g/ ^mm2 . The label materials 12a and 12b are made of polypropylene, and the heat shrinkage rate at 90°C is 6% vertically and 9% horizontally.
%. The heat shrinkage stress at this time is 65 g/mm ² in the vertical direction and 80 g/mm 2 in the horizontal direction.
g/ ^mm2 . The dimensions of the label body 12 before shrinking are 35mm x 38
mm.

Heating conditions were 90℃ for 1 minute. As a result, the heat shrinkage rate of the packaging film 11 after completing the packaging work was 13% in the vertical direction and 13% in the horizontal direction.
15%, the dimensions of label body 12 after shrinkage are 33mm x 34.5
mm.

After the packaging was completed, there were no wrinkles on the label body 12, and there was no misalignment between the packaging film 11 and the label body 12, and the label was in a good state of attachment.

(Example 2) The same packaging film 11 and label body 12 as in Example 1 were used, and the margin between the packaging film 11 and the contents was set to 10%.
A heat treatment was performed for 30 minutes.

After packaging is completed, the heat shrinkage rate of the packaging film 11 is 13% in length and 12% in width, and the dimensions of label body 12 are 32.5mm×
It was 34.5mm. The appearance of the label body 12 was good, with no wrinkles or the like and no misalignment at the attached portion.

[Effect of idea]

As described above, according to the present invention, the following effects can be achieved.

(1) The label body is made of a resin material whose shrinkage rate is lower than that of the packaging film at the same temperature.
Since this label body is adhered to the packaging film, the amount of shrinkage of the label body when the packaging film shrinks in the heating process is reduced. As a result, the image on the label is not distorted, the packaging quality can be improved, and the commercial value of the packaged contents can be increased.

(2) Since the shrinkage rate of the label material is low, printing defects such as distortion are less likely to occur when product information is printed on this label material. Therefore, compared to the conventional case where a product display is directly printed on a packaging film with a high shrinkage rate, the printing defect rate is lower and the total cost is extremely low. In particular, as shown in FIG. 4A of the embodiment, when printing is performed on the label material 12a attached to the release paper 13a, the release paper 13a functions as a mount, and the label material This allows for better printing.

(3) The label body is attached to the packaging film before packaging, and the label body is heat-shrinked together with the packaging film, so that the label material fits the shape of the contents. Therefore, even when packaging amorphous processed meat products as shown in FIGS. 6 and 7, the label portion has good fitting properties.

(4) The label body is made up of multiple sheets of label material, and the product information is printed on the overlapping surfaces of the label materials, so that the printing section can be seen through the label material. Become. As a result, clear product display can be constructed.
Furthermore, since the printing ink is sandwiched between the label materials, even if the packaging film is immersed in a bath of hot water during the heat shrinking process, the ink will not come into direct contact with a heating medium such as hot water. Then,
A wider range of ink types can be selected, allowing for economical label printing.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the packaging film and label body used in the shrink wrap according to the present invention, Fig. 2 is a perspective view of the shrink wrap to which the label body is attached, and Fig. 3 is a cross section of the label. Figures 4A and 4B are cross-sectional views of the label material constituting the label body, Figure 5 is a process diagram of packaging work, and Figures 6 and 7 are perspective views showing conventional shrink wrapping bodies. . 11...Packaging film, 12...Label body,
12a, 12b...Label material, 13a, 13b
...Release paper, 14a, 14b...Adhesive, 20...
...Contents, A...Printing of product display.

Claims (1)

[Scope of utility model registration request] A plurality of shrink wraps in which the contents are tightly packaged with a heat-shrink film and a product display is provided on the surface of the film, which has a lower heat shrinkage rate at the same temperature than the above-mentioned packaging film. A label body is formed by overlapping film materials and printing the product indication on the overlapping surface of the film materials, and this label body is attached to the surface of the packaging film and used for packaging A shrink wrapper characterized by being heat-shrinked together with a film.