JPH11130057A - Plastic sheet for packaging and plastic case covered with packaging film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic case packaged with a film which does not easily deform when heated by heat seal, and a plastic sheet for producing the same. SOLUTION: As to a plastic sheet for packaging, the width X of an adherend part 8 is made to be 1/3-2/3, or desirably 1/2-2/3 of the width Y of the side face panel part 2 where the adhered part 8 is adhered. A plastic case 20 is assembled from this sheet, the case 20 is covered with a plastic film, and the part adhered to the adherend part 8 of the side face panel part 2 is heat sealed. By this, because the thickness of the heat seal part is doubled, the heat in heat sealing is easily dispersed by the thickness, and moreover, because the rigidity is increased, heat deformation is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging plastic sheet and a packaging film exterior plastic case constituting a packaging film exterior plastic case for storing and selling tobacco, chocolate, cosmetics, and the like.

[0002]

2. Description of the Related Art Tobacco, chocolate, cosmetics, etc.
Since it is directly contained in the mouth and comes into contact with the skin, it is opened during transportation and storage, at store sales, etc., and is stored so that dust and dirt do not enter and foreign substances and poisons are mixed. In many cases, the packaging plastic case is covered with a plastic film.

[0003] Here, for the reason of economy and the like, a plastic sheet for wrapping for forming a conventional plastic case for wrapping is used as shown in FIG.
8 is relatively narrow, for example, the width of the adhesive margin piece portion 51 is generally formed to be about 1/4 of the width of the side plate portion 52 to be bonded, and this covers the plastic film. The same was true for the plastic case for packaging.

[0004]

However, when the packaging plastic sheet 51 constructed as described above is bent, bonded and assembled, the packaging plastic case is covered with a plastic film, and the plastic film is heat-sealed. There has been a problem that it is deformed by heat at the time of sealing.

[0005] In order to solve the above-mentioned conventional problems, the present invention provides a packaging plastic sheet and a packaging film package which are not easily deformed even when heat is applied by heat sealing and have a simple structure. No plastic case will be provided.

[0006]

In order to achieve the above object, the present invention relates to a plastic sheet for wrapping a plastic case, which is covered with a film, wherein the width of the adhesive margin is reduced by the heat of the film. Provided is a plastic sheet for packaging, wherein the width is set so as to overlap a seal portion. For example, 1/3 to 2 / of the width of the corresponding plate to be pasted
3, a plastic sheet for packaging characterized by forming a glue margin portion having a width of preferably 1/2 to 2/3. Also, the present invention provides a packaging plastic case by folding and bonding a packaging plastic sheet having a glue margin portion formed thereon, and externally covering the packaging plastic case, and a glue margin portion of a corresponding plate portion. Film-wrapped plastic case (hereafter referred to as “film-wrapped plastic case”) that is formed by heat-sealing the part bonded to
That. )I will provide a.

With the plastic sheet for packaging and the plastic case with a film having the above structure, the thickness at the heat sealing portion can be doubled, so that the heat at the time of heat sealing can be easily dispersed by the thickness, and The rigidity is increased, and thermal deformation can be prevented.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of a plastic sheet 1 for packaging according to an embodiment of the present invention. The plastic sheet 1 for packaging includes an upper surface plate portion 6, a side surface plate portion 2, and fold curves 11, 11, 11 above and below the front plate portion 3.
4 are provided in a row, and folding curves 11, 1
1, insert pieces 9, 9 are connected in series, and above the upper surface plate 6, insert pieces 10 are connected in series via a fold curve 11, on the upper and lower sides and on the right side of the side plate 4. The folding pieces 9 and 9 and the back plate 5 are connected to each other via the folding curve 11, and the bottom plate 7 and the bottom plate 7 via the folding curves 11 and 11 on the lower side and the right side of the back plate 5.
A glue margin piece portion 8 is continuously provided, and an insertion piece portion 10 is continuously provided below the side plate portion 7 via a folding curve 11.

As the plastic sheet 1 for packaging, a plastic sheet such as polyethylene terephthalate (PET), polypropylene (PP), polystyrene (PS) or the like is used because of its good folding resistance. In particular, polyethylene terephthalate (PET) is used. The sheet is preferable in terms of good transparency and high rigidity. Among them, amorphous PET (unstretched PET: hereinafter referred to as “A-PE”)
T ". ) Is preferable because the transparency is better and the strength is high irrespective of the sheet direction because it is not stretched. The thickness of the plastic sheet 1 for packaging is usually 0.1 mm to 0.8 mm, particularly 0.2 mm to 0.8 mm.
mm is preferable in consideration of folding resistance, rigidity and the like.
If the thickness is larger than 0.8 mm, the pressure for bending is excessively large, and if the thickness is smaller than 0.1 mm, it is easily bent or broken.

The width X of the adhesive margin portion 8 is preferably set to be 1/3 to 1/3 of the width Y of the face plate to which the adhesive margin portion 8 is bonded so as to be located at the heat seal portion of the plastic film for packaging.
The width is set to be 2/3, particularly preferably 1/2 to 2/3. Note that the glue margin portion 8 may be provided on the left side of the side plate portion 2 and bonded to the back plate portion 5.

FIG. 2 shows the plastic sheet 1 for packaging.
Is a perspective view of a packaging plastic case 20 assembled by bending each of the folding curves 11, applying an adhesive to the outer surface of the adhesive margin piece portion 8, and bonding the adhesive to the inner surface of the side plate portion 2. . In this way, by bonding the adhesive margin piece portion 8 to the side plate portion 2 and heat-sealing the side plate portion 2 at the bonding portion, the heat at the time of heat sealing is dispersed with a large thickness and the rigidity is increased. In addition, thermal deformation of the side plate 2 can be prevented. As the above adhesive,
A hot-melt type such as urethane or an instant adhesive such as cyanoacrylate can be used. It is more preferred to use a mold adhesive.

Next, a method of packaging and heat sealing the plastic case 20 for packaging will be described. A plastic film 21 with an opening tape is placed on the side plate 2, front plate 3, side plate 4 and back plate 5 of the plastic case 20 for packaging, and as shown in FIG. The edges 21a, 21a are brought into contact on the side plate 2 on which the glue margin piece 8 is located, and the area including this contact is heat-sealed. is there.). For example, when the width of the adhesive margin piece portion 8 is set to be larger than の of the width of the side plate portion 2, heat sealing may be performed along the center of the side plate portion 2. After being heat-sealed in this way, the film 21 is folded in contact with the top plate 6 and the bottom plate 7 and then the both ends of the film 21 are folded, thereby forming the film-covered plastic case 30 shown in FIG. Can be.

As the plastic film 21 for packaging, it is usually preferable to use a stretched film having transparency and heat resistance, such as a polyethylene (PE) or polypropylene (PP) film. 5 μm
It is preferable to use an oriented polypropylene (OPP) film having a thickness of from 60 μm to 60 μm, especially from 10 μm to 50 μm. The temperature at the time of heat sealing is appropriately set at about 85 to 120 ° C., preferably 90 to 98 ° C. in consideration of the heat melting temperature of the film. Heat seal width is 2mm ~ 10mm,
Preferably, it is set to 3 mm to 6 mm.

(Example) A-PET sheet (thickness 0.3)
mm, homo-PET monolayer, intrinsic viscosity 0.69) in a shape as shown in FIG. 1 (side width 32 mm, glue margin width 17 m)
m) was punched out and processed (formation of a bending line) to form a plastic sheet for packaging. An adhesive (urethane-based adhesive) was applied to the glue margin part, and the glue margin part was stuck to the side plate part to produce a plastic case for packaging. Then, cover the OPP film with opening tape (thickness 20 μm),
Place a hot plate (5 mm wide) on the side plate where the glue margin is located.
X 100 mm length) and heat sealed (97-9)
8 ° C.) to produce a film-covered plastic case of the present invention.

Comparative Example On the other hand, as a comparative example, A-PE
A T sheet (thickness 0.3 mm, homo PET single layer, intrinsic viscosity 0.69) was formed into a shape as shown in FIG.
m, and the width of the adhesive margin portion was 17 mm), and the resultant was die-cut and processed (formation of a bending line) to form a plastic sheet for packaging.
An adhesive (urethane-based adhesive) was applied to the glue margin part, and the glue margin part was stuck to the side plate part to produce a plastic case for packaging. Then, an OPP film with an opening tape (thickness: 20 μm) is covered, and a hot plate (width of 5 m) is provided at the center of the side plate.
mx 100mm length) and heat seal (97 ~
98 ° C.) to produce a conventional film-covered plastic case.

When the OPP film was peeled off and the side plate was observed for the product of the present invention and the conventional product, a slight press mark formed when the hot plate was brought into contact with the product of the present invention was observed. No deformation was observed in the side plate. On the other hand, in the case of the conventional product, a wave-like or irregular deformation was recognized in the side plate portion.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a packaging plastic sheet of the present invention.

FIG. 2 is a perspective view showing a packaging plastic case formed by folding and pasting 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 an example of the film-sheathed plastic case of the present invention, in which the plastic case for packaging shown in FIG. 2 is wrapped with a plastic film.

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 part 3 Front plate part 5 Back plate part 6 Top plate part 7 Bottom plate part 8 Adhesive margin part 11 Fold curve 20 Packaging plastic case 21 Packaging plastic film 22 Heat seal Part 30 plastic case with film exterior

Claims (3)

[Claims] 1. A packaging plastic sheet for forming a plastic case, which is covered with a film, wherein the width of the adhesive margin portion is set to a width overlapping with the heat sealing portion of the film. Sheet. 2. 1/3 to 2/3 of the width of the corresponding plate to be bonded
A plastic sheet for packaging, characterized in that a glue margin portion having a width of is formed. 3. A packaging plastic sheet is formed by folding and pasting a packaging plastic sheet having a glue margin portion formed thereon, and the packaging plastic case is exteriorly covered with a glue margin portion of a corresponding plate portion. A packaging film exterior plastic case, wherein a bonded portion is heat-sealed.