JP3701110B2 - Packaging film exterior plastic case and packaging method for plastic case - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention also relates tobacco, chocolate or packaging film the outer plastic case the cosmetics constituting the packaging film covered plastic case for sale is accommodated in the packaging process.
[0002]
[Prior art]
Tobacco, chocolate, cosmetics, etc. are contained directly in the mouth and touch the skin. In many cases, the packaging plastic case for storing them is externally covered with a plastic film.
[0003]
Here, the packaging plastic sheet for constituting the conventional packaging plastic case has a relatively narrow width of the glue margin piece 58 as shown in FIG. In general, the width of the marginal part 51 is formed to be about ¼ of the width of the side plate part 52 to be bonded. This is the same as in the case of a plastic case for packaging with a plastic film. It was.
[0004]
[Problems to be solved by the invention]
However, when the packaging plastic sheet 51 having the above configuration is bent and bonded and then assembled, the packaging plastic case is covered with a plastic film, and when the plastic film is heat-sealed, it is deformed by heat during heat-sealing. was there.
[0005]
SUMMARY OF THE INVENTION Accordingly, in order to solve the above-described conventional problems, the present invention is to provide a packaging film outer plastic case that is not easily deformed even when heat is provided by heat sealing and that has a simple configuration.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the packaging film-wrapped plastic case of the present invention is made of polyethylene terephthalate with a thickness of 0.1 mm to 0.8 mm having a glue piece on one side and a folding line formed on the surface. A case formed by bending a plastic sheet for packaging, wherein the paste margin piece is coated with a urethane-based reactive adhesive and bonded to the other side of the sheet to form a packaging plastic case. The plastic case for the product is covered with a plastic film, and the plastic film is heat-sealed along a portion where the plastic sheet is bonded to the paste margin piece of the corresponding plate portion.
The plastic case packaging method of the present invention comprises a polyethylene terephthalate packaging plastic sheet having a thickness of 0.1 mm to 0.8 mm having a glue piece on one side and a fold curve formed on the surface. Bending along a folding line and applying the urethane reactive adhesive to the other side of the sheet to form a box-shaped case, and then covering the case with a plastic film. A heat plate is applied to the film along the portion where the surrogate piece is located and heat-sealed, and the case is wrapped with the film.
[0007]
With the packaging film exterior plastic case having the above configuration, the thickness at the heat seal portion can be doubled, so that the heat at the time of heat sealing can be easily dispersed with the thickness, and the rigidity is increased and the heat is increased. Deformation can be prevented.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
[0009]
FIG. 1 is a plan view of a packaging plastic sheet 1 according to an embodiment of the present invention.
This plastic sheet for packaging 1 has an upper surface plate portion 6 and side surface plate portions 2 and 4 connected to the upper side and the left and right sides of the front plate portion 3 via folding lines 11, 11, 11. Folding piece portions 9 and 9 are continuously provided on both upper and lower sides via folding lines 11 and 11, and insertion piece portions 10 are provided on the upper side of the upper surface plate portion 6 via folding lines 11, and the side plate portions are provided. Folding piece portions 9 and 9 and a back plate portion 5 are connected to the upper and lower sides and the right side of 4 through folding lines 11, and a bottom plate is placed on the lower side and the right side of the back plate portion 5 through folding curves 11 and 11. The part 7 and the glue margin piece part 8 are provided continuously, and the insertion piece part 10 is provided continuously via the folding line 11 on the lower side of the side plate part 7.
[0010]
As the plastic sheet 1 for packaging, plastic sheets such as polyethylene terephthalate (PET), polypropylene (PP), and polystyrene (PS) are used because of its good folding resistance, but the polyethylene terephthalate (PET) sheet is particularly transparent. It is preferable in that it has good properties and high rigidity, and amorphous PET (unstretched PET: hereinafter referred to as “A-PET”) is more transparent and is not stretched. Regardless of whether the strength is high.
The thickness of the packaging plastic sheet 1 is usually 0.1 mm to 0.8 mm, particularly preferably 0.2 mm to 0.8 mm in view of folding resistance and rigidity.
This is because if it is thicker than 0.8 mm, the pressure for bending is excessive, and if it is thinner than 0.1 mm, it is easy to bend and break.
[0011]
The margin piece 8 is preferably located at the heat seal portion of the packaging plastic film so that the width X is 1/3 to 2/3 of the width Y of the face plate portion to which the margin piece 8 is bonded. Particularly preferably, the width is set to 1/2 to 2/3.
The paste margin piece 8 may be provided on the left side of the side plate 2 and may be bonded to the back plate 5.
[0012]
2, the packaging plastic sheet 1 is bent at each folding line 11, an adhesive is applied to the outer surface of the adhesive margin piece portion 8, and is bonded to the inner surface of the side plate portion 2 for assembly. 2 is a perspective view of a packaging plastic case 20. FIG.
In this way, the paste margin piece portion 8 is bonded to the side plate portion 2 and heat sealing is performed on the side plate portion 2 of the bonded portion to disperse the heat at the time of heat sealing with thickness and to increase rigidity. The thermal deformation of the side plate 2 can be prevented.
As the adhesive, a hot melt type such as urethane, or an instantaneous adhesive such as cyanoacrylate can be used. However, since heat is further provided by heat sealing after bonding, it is once melted again after heat fusion. It is more preferable to use a reactive adhesive such as urethane.
[0013]
Next, the packaging and heat sealing method of the packaging plastic case 20 will be described.
The side plate part 2, the front plate part 3, the side plate part 4 and the back plate part 5 of the packaging plastic case 20 are covered with a packaging plastic film 21 with an opening tape, and as shown in FIG. The edge portions 21a and 21a are brought into contact with the side plate portion 2 where the adhesive margin piece portion 8 is located, and the region including the contact portion is heat-sealed (in the figure, 22 scattered portions are heat seal portions. is there.). For example, when the width of the adhesive margin piece 8 is set to be larger than ½ of the width of the side plate 2, heat sealing may be performed along the central portion of the side plate 2. After heat-sealing in this manner, the both ends of the film 21 are folded after being brought into contact with the top surface plate portion 6 and the bottom surface plate portion 7, and thus the film exterior plastic case 30 shown in FIG. 4 is configured. Can do.
[0014]
As the packaging plastic film 21, it is usually preferable to use a stretched film having transparency and heat resistance, such as a polyethylene (PE) film and a polypropylene (PP) film, and particularly, a thickness of 5 μm to 5 μm. It is preferable to use a stretched polypropylene (OPP) film of 60 μm, especially 10 μm to 50 μm. The temperature at the time of heat sealing is appropriately set to about 85 to 120 ° C., preferably 90 to 98 ° C. in consideration of the heat melting temperature of the film. The heat seal width is set to 2 mm to 10 mm, preferably 3 mm to 6 mm.
[0015]
(Example)
A-PET sheet (thickness 0.3 mm, homo-PET single layer, intrinsic viscosity 0.69) is die-cut and processed into a shape as shown in FIG. 1 (side width 32 mm, glue margin piece width 17 mm) ( A fold line was formed) to form a plastic sheet for packaging. An adhesive (urethane adhesive) was applied to the paste margin piece, and the paste margin piece was bonded to the side plate portion to produce a plastic case for packaging. Then, an OPP film with an opening tape (thickness 20 μm) is covered, and a heat plate (width 5 mm × length 100 mm) is brought into contact with the portion where the adhesive margin piece portion of the side plate portion is located, and heat sealing (97 to 98). C.) to produce a film-clad plastic case of the present invention.
[0016]
(Comparative example)
On the other hand, as a comparative example, an A-PET sheet (thickness 0.3 mm, homo-PET single layer, intrinsic viscosity 0.69) is formed into a shape as shown in FIG. 5 (side face width 32 mm, paste margin piece width 17 mm). A plastic sheet for packaging was formed by die cutting and processing (formation of a folding line). An adhesive (urethane adhesive) was applied to the paste margin piece, and the paste margin piece was bonded to the side plate portion to produce a plastic case for packaging. Then, an OPP film with an opening tape (thickness 20 μm) is coated, and a heat plate (width 5 mm × length 100 mm) is brought into contact with the center portion of the side plate portion to heat-seal (97 to 98 ° C.). An exterior plastic case was produced.
[0017]
About the present invention product and the conventional product, the OPP film was peeled off and the side plate portion was observed. As for the present invention product, the side plate portion was observed with some traces formed when the hot plate was brought into contact therewith. No deformation was observed. On the other hand, in the conventional product, a corrugated or uneven deformation was observed in the side plate portion.
[Brief description of the drawings]
FIG. 1 is a plan view showing an example of a plastic sheet for packaging used in the present invention .
2 is a perspective view showing a packaging plastic case formed by bending and bonding the packaging plastic sheet of FIG. 1. FIG.
3 is a side view showing a state where the packaging plastic case of FIG. 2 is wrapped with a transparent packaging plastic film and heat-sealed. FIG.
4 is a perspective view showing a plastic case in which the plastic case for packaging of FIG. 2 is wrapped with a plastic film, which is an example of the film-cased plastic case of the present invention.
FIG. 5 is a plan view showing an example of a conventional plastic sheet for packaging.
[Explanation of symbols]
1,50 Plastic sheet for packaging 2, 4 Side plate portion 3 Front plate portion 5 Back plate portion 6 Top plate portion 7 Bottom plate portion 8 Adhesive piece
11 Folding curve
20 Plastic case for packaging
21 Plastic film for packaging
22 Heat seal part
30 Film exterior plastic case

Claims (2)

A case formed by bending a plastic sheet for packaging made of polyethylene terephthalate having a thickness of 0.1 mm to 0.8 mm having a paste margin piece on one side and a folding line formed on the surface,
Applying a urethane reactive adhesive to the paste margin piece and pasting it on the other side of the sheet constitutes a plastic case for packaging,
The packaging plastic case is configured by covering the plastic case with a plastic film and heat-sealing the plastic film along a portion of the plastic sheet corresponding to the paste margin piece of the corresponding plate portion. Film exterior plastic case. A plastic sheet for packaging made of polyethylene terephthalate having a thickness of 0.1 mm to 0.8 mm with a glue margin piece on one side and a fold curve formed on the surface is folded along the fold curve and the glue margin piece is urethane. After applying a system reactive adhesive and pasting it on the other side of the sheet to form a box-shaped case,
A method for packaging a plastic case, comprising: covering the case with a plastic film, applying a heat plate to the film along a portion where the adhesive margin piece portion is located, heat-sealing, and packaging the case with the film.

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