JP4491944B2 - Easy-opening processing method and apparatus for packaging material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an easy-opening method and apparatus for a packaging material used for a packaging bag, which is made of a multilayer film including an orientation resin film on a surface layer and can be easily torn and opened by hand.
[0002]
[Prior art]
For packaging materials for packaging bags, generally oriented resin films that are oriented by stretching are used to give strength. However, a packaging bag using a packaging material in which such orientation resin films are laminated has high strength, but it is difficult to tear it by hand and open it easily.
[0003]
Therefore, conventionally, easy opening has been imparted to the packaging material by machining or the like. In imparting easy-openability by machining, the strength of the packaging material is partially reduced by providing a fine cut with a blade in a part of the packaging material or providing a rough surface with a grindstone. Thereby, it was able to open easily by tearing a notch part or a rough surface by hand.
[0004]
Another example of a technique for imparting opening correction to a packaging bag is described in Japanese Utility Model Publication No. 59-87445. According to the technique described in this publication, an easily cutable area is formed in a part of the film by heat-treating the film made of the thermoplastic resin. This makes it possible to easily tear the film by hand along the easily cut area.
[0005]
[Problems to be solved by the invention]
However, in the conventional easy-opening processing technology for packaging materials by machining, wear of tools such as blades and grindstones that easily open the packaging material is inevitable. And when these tools are worn out, it becomes impossible to give the packaging material sufficient openability. In addition, since it is difficult to determine the degree of wear of the tool, there is a possibility that a large number of defective products that are easily opened due to wear may be generated.
In addition, in the case of machining, fine swarf of the packaging material is generated. Therefore, if this swarf is insufficiently removed, the swarf generated by the processing of the tool is produced in the packaging bag when the bag is made using the packaging material. There is a risk of contamination.
[0006]
Moreover, in the easy-opening processing technology for the packaging material by the heat treatment disclosed in the above publication, the orientation resin film is once melted by the heat treatment. For this reason, the heat-treated portion of the packaging material becomes wrinkled and the appearance becomes unsightly, and it may be difficult to put it into practical use as it is.
[0007]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an easy-opening technique that can easily tear a packaging material while suppressing deterioration in appearance.
[0008]
[Means for Solving the Problems]
In order to achieve this object, according to the easy-opening processing method of a packaging material according to claim 1 of the present invention, a packaging material of a multilayer film including an orientation resin film on the surface layer is used at a melting point of the orientation resin film or less. The temperature control roll whose temperature is adjusted to the surface temperature of the sheet is supported and conveyed with the orientation resin film facing outside, and a part of the packaging material is heated to a temperature equal to or higher than the melting point of the orientation resin film on the temperature control roll. The method includes a heat treatment for heating and a cooling treatment for pressing the packaging material while cooling the packaging material to a temperature equal to or lower than the melting point by the cooling means immediately after the heat treatment.
[0009]
Moreover, according to the easy-opening processing apparatus for a packaging material according to claim 2 of the present invention, the packaging material of the multilayer film containing the orientation resin film on the surface layer is supported and conveyed with the orientation resin film facing outside. A temperature control roll adjusted to a surface temperature below the melting point of the orientation resin film, a heating means for heating a part of the packaging material to a temperature above the melting point of the orientation resin film on the temperature control roll, and a heat treatment Immediately after, a cooling means for cooling the packaging material to a temperature below the melting point is provided.
[0010]
Thus, according to the easy-opening processing method of the packaging material according to claim 1 and the easy-opening processing device of packaging material according to claim 2, there is no possibility of generation of defective products due to wear of the tool, When the packaging material is used to form a packaging bag, there is no possibility that chips will be mixed into the packaging bag. Furthermore, since the packaging material can be processed in a non-contact manner, productivity (throughput) can be improved. In addition, by easily changing the heating position, it is possible to easily cope with changes in product specifications.
[0011]
Further, according to the present invention, since the packaging material is heated on the temperature control roll, the temperature of the inner layer other than the orientation resin film is heated while the outer orientation resin film of the packaging material is heated to the melting point or higher. Can be reduced. For this reason, the melting | fusing by heating of inner layers other than the orientation resin film among packaging materials can be avoided.
Furthermore, since the packaging material is cooled and pressed by the cooling means immediately after heating, generation of wrinkles in the heat-treated portion of the packaging material can be suppressed. Furthermore, the crystalline film becomes transparent by rapid cooling, and the wrinkles can be made inconspicuous. Thereby, it can be made easy to tear a packaging material, suppressing the deterioration of the external appearance of a packaging material.
[0012]
Moreover, according to invention of Claim 3, it is set as the structure in which a cooling means has a pair of cooling roll which cools and presses a packaging material.
Thus, if it presses on a temperature control roll and a cooling roll, it can press, cooling the packaging material immediately after a heating rapidly. Thereby, deterioration of the appearance of the packaging material can be further suppressed. Moreover, since the temperature control roll is used for cooling and pressing, the apparatus can be downsized.
[0013]
Moreover, according to invention of Claim 4, it is set as the structure in which a cooling means has a pair of cooling roll which cools and presses a packaging material.
Thus, if a packaging material is cooled and pressed with a pair of cooling roll, it can be pressed, cooling a packaging material more reliably.
[0014]
Moreover, according to invention of Claim 5, it is set as the structure which provided the hot air blowing apparatus which blows a hot air to a part of packaging material supported by the temperature control roll as a heating means.
With such a configuration, a desired position of the packaging material can be easily heated by blowing hot air.
[0015]
In addition, according to the invention described in claim 6, it is configured to include the preheating means for heating the packaging material to a temperature equal to or lower than the melting point immediately before performing the heat treatment by the heating means.
Thus, if the packaging material is preheated by the preheating means, a part of the packaging material can be heated to a temperature equal to or higher than the melting point in a shorter time during the heat treatment by the heating means. Thereby, speeding up of an easy opening process can be achieved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the easy-opening processing method and apparatus for a packaging material of the present invention will be described together.
Here, an example of processing a surface layer of a biaxially stretched polyethylene terephthalate (PET) film and a belt-shaped packaging material 4 in which polyethylene, aluminum foil and polyethylene are laminated as a multilayer film including an orientation resin film in the surface layer will be described. .
[0017]
[First embodiment]
First, with reference to FIG. 1, the structure of the easy-opening processing apparatus of the packaging material of 1st embodiment is demonstrated.
As shown in FIG. 1, the easy-opening processing apparatus of the packaging material in 1st embodiment is comprised by the temperature control roll 1, the hot air blowing apparatus 2 as a heating means, and the cooling roll 3 as a cooling means. .
[0018]
The temperature control roll 1 has a diameter of 10 cm, and its surface temperature is adjusted to a temperature (for example, room temperature) below the melting point of the orientation resin film.
In adjusting the temperature of the temperature control roll 1, a temperature control function may be directly incorporated into the temperature control roll 1. For example, a rubber roll that rotates while being pressed by another cooling source may be used as the temperature control roll 1.
[0019]
Then, the temperature control roll 1 supports and conveys the packaging material 4 at a speed of 50 revolutions per minute (peripheral speed of about 16 m / min) with the oriented resin film facing outside. A tension is applied to the packaging material 4 that is supported and conveyed.
[0020]
Moreover, the hot air blower 2 blows hot air to a part of the packaging material 4 supported by the temperature control roll 1, thereby causing a part of the packaging material 4 to have a temperature equal to or higher than the melting point (for example, 250 to 264 ° C.) of the orientation resin film. Heat to.
Here, a non-frame torch having an output of 200 V 2 kW is used as the hot air blower 2, a voltage of 115 V is supplied by a slidac (100 V10A), and hot air at which the tip temperature of the nozzle of the hot air blower 2 becomes about 650 ° C. is 17 Nl. Sprayed at a flow rate of / min. As a result, the temperature of the PET film in the heated portion of the packaging material becomes equal to or higher than the melting point, and melts to break the orientation. As a result, the strength of the PET film can be partially reduced.
[0021]
Thus, since the packaging material 4 is heated on the temperature control roll 1, the temperature of the inner layer other than the orientation resin film is adjusted while heating the orientation resin film on the outer side of the packaging material 4 to the melting point or higher. Can be reduced. For this reason, it is possible to avoid melting due to heating of the inner layer other than the orientation resin film in the packaging material.
In addition, in FIG. 1, only the nozzle of the hot air blower 2 is shown.
[0022]
In particular, as a multilayer film including an orientation resin film in the surface layer, for example, a biaxially stretched polyethylene terephthalate (PET) film, LLDPE (linear low-density polyethylene), an aluminum foil, and a packaging material in which LLDPE are sequentially laminated are heated. In the case of processing, it is necessary to lower the temperature of the inner layer other than the PET film (particularly LLDPE) by the temperature control roll 1.
[0023]
Moreover, the cooling roll 3 is arrange | positioned so that the packaging material 4 may be cooled and pressed with the temperature control roll 1 as a pair. And immediately after performing heat processing, the packaging material 4 is cooled by this cooling roll 3 to the temperature below melting | fusing point.
In adjusting the temperature of the cooling roll 3, a temperature control function may be incorporated directly into the cooling roll 3. For example, a rubber roll that rotates while being pressed by another cooling source may be used as the cooling roll 3.
[0024]
Then, immediately after heating, the packaging material 4 is cooled and pressed with the cooling roll 3 in a tensioned state, whereby generation of wrinkles in the heat-treated portion of the packaging material can be suppressed. Thereby, it is possible to easily tear the packaging material while suppressing deterioration of the appearance of the packaging material 4.
[0025]
[Second Embodiment]
Next, with reference to FIG. 2, the structure of the easy-opening processing apparatus of the packaging material in 2nd embodiment is demonstrated.
As shown in FIG. 2, the easy-opening processing apparatus of the packaging material of 2nd embodiment is with the temperature control roll 1, the hot air blowing apparatus 2 as a heating means, and a pair of cooling rolls 31 and 32 as a cooling means. It is configured.
[0026]
And the packaging material 4 sprayed with hot air on the temperature control roll 1 is pressed by the pair of cooling rolls 31 and 32 while being cooled, as in the first embodiment. Thus, since the packaging material 4 is pressed by the pair of cooling rolls 31 and 32 immediately after the heating, generation of wrinkles in the heat-treated portion of the packaging material 4 can be suppressed. As a result, it is possible to easily tear the packaging material while suppressing deterioration of the appearance of the packaging material 4.
[0027]
[Third embodiment]
Next, with reference to FIG. 3, the structure of the easy-opening processing apparatus of the packaging material in 3rd embodiment is demonstrated.
In the example shown in FIG. 3A, in addition to the apparatus configuration shown in FIG. 1, an infrared heater 5 as a preheating means is provided immediately before the hot air blower 2. Moreover, in the example shown to (B) of FIG. 3, the preheating roll 6 is provided as a preheating means.
[0028]
And in 3rd embodiment, immediately before performing the heat processing by the hot air blower 2 by these preheating means 5 and 6, the packaging material 4 is heated to the temperature (for example, 100-200 degreeC) below melting | fusing point of PET film. Thus, by preheating (preheating) the packaging material 4 by the preheating means 5 and 6, the speed of the easy opening process can be increased.
In addition, a preheating means is not limited to the infrared heat 5 and the preheating roll 6, For example, conventionally suitable means, such as a hot air, high frequency heating, or an oven, can be used.
[0029]
In the above-described embodiment, the example in which the present invention is configured under specific conditions has been described. However, the present invention can be variously modified. For example, in the above-described embodiment, the example in which the hot air blowing device is used as the heating device has been described. However, in the present invention, the heating device is not limited to the hot air blowing device. For example, an infrared heater may be used as the heating device.
[0030]
In the above-described embodiment, the example in which the cooling roll is provided as the cooling means has been described. However, the cooling means of the present invention is not limited to this, and the packaging material is cooled while applying tension to the packaging material immediately after heating. -It can be set as the arbitrary structures which can be pressed.
[0031]
Moreover, in the above-mentioned embodiment, although the example which processes the multilayer film which has a biaxially stretched PET film on the surface layer was demonstrated, the multilayer film of the process target of this invention is not limited to this, Orienting resin other than PET film You may apply to the multilayer film which contains a film in a surface layer.
[0032]
Moreover, the packaging material to which the process of this invention was given can be used not only for a packaging bag but for the heat seal lid | cover of a container, for example. As a result, a lid that is easy to tear and open can be obtained. In addition, the material of the container main body which a cover covers is not limited.
[0033]
【The invention's effect】
As described above in detail, according to the present invention, there is no possibility of generation of defective products due to wear of tools, and there is no possibility that chips are mixed in the packaging bag. Furthermore, since the packaging material can be processed in a non-contact manner, productivity can be improved. In addition, by easily changing the heating position, it is possible to easily cope with changes in product specifications.
[0034]
Further, according to the present invention, since the packaging material is heated on the temperature control roll, the temperature of the inner layer other than the orientation resin film is heated while the outer orientation resin film of the packaging material is heated to the melting point or higher. Can be reduced. For this reason, melting by heating of the inner layer other than the orientation resin film of the packaging material can be avoided. Furthermore, since the packaging material is cooled and pressed by the cooling means immediately after heating, generation of wrinkles in the heat-treated portion of the packaging material can be suppressed. Thereby, it can be made easy to tear a packaging material, suppressing the deterioration of the external appearance of a packaging material.
[Brief description of the drawings]
FIG. 1 is a schematic diagram for explaining a configuration of a packaging material easy-opening processing apparatus according to a first embodiment;
FIG. 2 is a schematic diagram for explaining a configuration of a packaging material easy-opening processing apparatus according to a second embodiment;
FIGS. 3A and 3B are schematic views for explaining the configuration of a packaging material easy-opening processing apparatus according to a third embodiment; FIGS.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Temperature control roll 2 Hot air blower 3 Cooling roll 4 Packaging material 5 Far-infrared heater 6 Preheating roll 31, 32 Cooling roll

Claims (6)

While supporting and transporting the packaging material of the multilayer film containing the orientation resin film in the surface layer, with the orientation resin film facing outside by a temperature control roll whose temperature is adjusted to the surface temperature below the melting point of the orientation resin film, On the temperature control roll, a heat treatment for heating a part of the packaging material to a temperature equal to or higher than the melting point of the orientation resin film;
And a cooling process of pressing the packaging material while cooling the packaging material to a temperature equal to or lower than the melting point by a cooling means immediately after the heat treatment. A temperature control roll whose temperature is adjusted to a surface temperature below the melting point of the orientation resin film, carrying and supporting the packaging material of the multilayer film containing the orientation resin film on the surface layer, with the orientation resin film facing outside,
Heating means for heating a part of the packaging material to a temperature equal to or higher than the melting point of the orientation resin film on the temperature control roll;
Immediately after performing the heat treatment, the packaging material is provided with a cooling means for cooling the packaging material to a temperature equal to or lower than the melting point. 3. The packaging material easy-opening processing apparatus according to claim 2, wherein the cooling means includes a cooling roll that cools and presses the packaging material in a pair with the temperature control roll. The packaging material easy-opening processing apparatus according to claim 2, wherein the cooling means has a pair of cooling rolls for cooling and pressing the packaging material. 5. The packaging material easy-opening processing apparatus according to claim 2, wherein the heating means includes a hot air blowing device that blows hot air onto a part of the packaging material supported by the temperature control roll. 6. The packaging material easy-opening processing apparatus according to claim 2, further comprising preheating means for heating the packaging material to a temperature equal to or lower than the melting point immediately before performing the heat treatment by the heating means. .

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