JP2518858Y2 - Packaging bag - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag which can be easily opened from a folded portion of the packaging bag.

[0002]

2. Description of the Related Art Generally, a packaging bag made of cellophane, a composite film obtained by laminating a polyethylene film on paper or the like can be easily opened by hand without using a cutter. Although it has a wide range of uses, this type of packaging bag has a low breaking strength and, in particular, lacks moisture resistance, so that the content to be enclosed is limited. Therefore, a plastic bag was used as a material for the packaging bag to improve the breaking strength, improve the moisture resistance, and reduce the content of the package.

A packaging bag formed by using a plastic laminate film as a packaging bag material is difficult to open by hand because of the tear strength of the plastic laminate film, which is a packaging bag material, and it is difficult to open the packaging bag.
A cutting tool such as a cutter is required. It is troublesome to prepare a cutting tool such as a cutter in advance for opening the packaging bag formed of the plastic laminated film, so a user requests a packaging bag that can be easily opened by hand without using a cutting tool such as the cutter. By providing a V-shaped notch or an I-shaped notch in the heat-sealing portion of the packaging bag, the V-shaped notch or the I-shaped notch serves as an unsealing introduction portion to facilitate the unsealing from the heat-sealing portion. made.

As in the packaging bag disclosed in US Pat. No. 3,608,815, an unsealing auxiliary area is formed by penetrating a single stretched plastic film with a pin, and the unstretched plastic film is formed in the unsealing auxiliary area. Laminate the packaging bag bent and formed so that it is located at the folding part, or the two stretched plastic films that formed the opening assisting area by penetrating the pin by shifting the position of the pin through hole in the opening assisting area. There is known a packaging bag in which the plastic laminate film formed in this manner is bent and formed so that the opening assisting area is located at the folding portion of the packaging bag.

[0005]

[Problems to be Solved by the Invention] A material obtained by cutting a plastic laminate film into a rectangular shape is folded in two and then folded into three.
The packaging bag having the heat-sealed end portion can be easily opened from the heat-sealed portion by providing the heat-sealed portion with a V-shaped notch or the like. This type of packaging bag, if the packaging material processing manufacturer manufactures the packaging bag and delivers it to the user, at the packaging material processing manufacturer, notching the heat seal part of the packaging bag at the stage of molding the packaging bag. Since it can be performed, there is no problem in providing a V-shaped notch or the like in the heat seal portion, but the packaging material processing manufacturer delivers the rolled packaging material material to the user,
When the packaging bag is formed while the user is filling the contents with a contents filling machine, it is difficult to form a notch on the heat-sealed portion of the packaging bag.

[0006] A packaging bag provided with an opening assisting area by penetrating a pin in a stretched plastic film can be easily opened by hand without the need for a cutting tool such as a cutter. The through holes provided in the area reduce the moisture permeability and oxygen permeability of the packaging bag.For example, when a moisture-sensitive product such as coffee powder or rice cracker is enclosed, the product will not absorb moisture. As a result, the product becomes absorbed and cannot be used as a packaging bag for packaging a product that is resistant to moisture, and the product to be packaged is limited. A packaging bag formed of a plastic laminate film in which two stretched plastic films are laminated by shifting the positions of the pin through holes in the opening assisting area provided on the stretched plastic film may be able to eliminate the above-mentioned difficulties. This type of packaging bag
It is difficult to position the pin through holes of the stretched plastic laminate film to be laminated, and even if the opening assisting area formed by the pin through holes is provided in the bent portion of the packaging bag, this opening assisting area is opened as the opening introduction section. Difficult to do.

The present invention has been made in view of the above points, and a plastic laminate film formed by laminating a stretched plastic film having a rough surface portion and a non-stretched unstretched plastic film is used as a rough opening tape. Bending molding so that the surface part is located at the bent part of the packaging bag, and using the rough surface part for opening as the opening introduction part, by breaking the unstretched plastic film having the property of not breaking easily, It is an object to provide a packaging bag that can be easily opened.

[0008]

The packaging bag of the present invention is formed by bending a plastic laminate film having a rectangular shape and heat-sealing the joint end portion to form a tubular portion. The open end of the tubular portion is formed. In a packaging bag heat-sealed, by laminating the plastic laminate film, a stretched plastic film having a rough surface portion having a through hole with a predetermined width and an unstretched unstretched plastic film are laminated to form a rough surface portion for opening. A packaging bag, characterized in that the plastic laminate film is formed by bending so that the stretched plastic film is on the outside and the rough surface portion for opening is located only at the folding portion of the packaging bag.

In the packaging bag of the present invention, the opening rough surface portion is formed by the rough surface portion formed by at least the through hole provided in the stretched plastic film and the extrusion laminating means filled in at least the through hole of the rough surface portion. It can be composed of a plastic material containing an anchoring agent when forming a plastic laminate film, and the rough surface portion of the stretched plastic film is formed by making the surface of the stretched plastic film a rough surface by pressing with sandpaper. be able to.

[Action]

In the packaging bag of the present invention, the rough surface portion for opening formed by covering the rough surface portion provided on the stretched plastic film with the smooth surface of the non-stretched unstretched plastic film is positioned at the bent portion of the packaging bag. By doing so, it is possible to tear the unstretched plastic film that is difficult to tear by using the rough surface portion for opening provided on the stretched plastic film as the opening introduction portion,
As a result, it is possible to easily open the packaging bag from the bent portion.

Further, in the packaging bag of the present invention, by filling at least the through holes of the rough surface portion provided with the stretched plastic film with the rough surface portion for opening, the moisture permeability and the oxygen permeability of the rough surface portion for opening can be improved. You can prevent the decline,
As a result, the contents to be enclosed are hardly restricted.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example in which the packaging bag according to the present invention is applied to a pillow type packaging bag 1. This pillow type packaging bag 1 has a rectangular plastic laminate film 2 with joint ends 3 and 3 at the center of the back surface. Bend molding so as to be located at, and heat-seal the joint ends 3 and 3 to form a tubular portion,
It is formed by heat-sealing the open end of the tubular portion.

The above plastic laminate film 2
As shown in FIG. 2, is made by laminating a biaxially oriented polypropylene film 4 having a thickness of 20 microns with a polyethylene film 5 having a thickness of 40 microns by extrusion laminating means. That is, the plastic laminate film 2 is formed by the biaxially stretched polypropylene film 4 and the unstretched polyethylene film 5. When linearly opening the pillow type packaging bag 1 formed of the plastic laminate film 2,
It is desirable to change the biaxially stretched polypropylene film of the plastic laminate film 2 to a uniaxially strongly stretched polypropylene.

A rough surface portion 6 for opening is formed on the bent portion 1a located at the side edge of the pillow type packaging bag 1 as shown in FIG. The opening rough surface portion 6 is a bent portion 1a of the packaging bag 1 when the plastic laminate film 2 having a predetermined size is formed by bending to form the pillow type packaging bag 1.
Located at the site corresponding to. The opening rough surface portion 6 is 2
A rough surface portion 9 having a predetermined width and a predetermined length, which comprises a plurality of concave portions 7 and through holes 8 formed by pressing an abrasive grain surface against one surface of the axially stretched polypropylene film 4, and the concave portions 7 and the through holes of the rough surface portions 9. 8 is composed of a plastic material 10 filled. The plastic material 10 is filled in the recesses 7 and the through holes 8 of the rough surface portion 9 when the polyethylene film 5 is extruded and laminated on the biaxially oriented polypropylene film 4 by using an extruding laminating means to form the plastic laminated film 2. It The plastic material 10 also includes an anchor agent applied to the surface of the biaxially oriented polypropylene film 4 during extrusion lamination.

The rough surface portion 9 formed on the biaxially oriented polypropylene film 4 is molded by the rough surface forming device 11 shown in FIG. The rough surface forming device 11 includes a metal roll 12
And the rough surface forming roll 12a elastically contacting the metal roll 12
And a grain size of 100 wound around the rough surface forming roll 12a.
No. 2 sandpaper 13 and the biaxially oriented polypropylene film 4 is passed between the metal roll 12 and the rough surface forming roll 12a to wind the biaxially oriented polypropylene film 4 on one surface of the rough surface forming roll 12a. The rotated sandpaper 13 is pressed, so that the sandpaper 13 is attached to one surface of the biaxially oriented polypropylene film 4.
The rough surface portion 9 including the concave portion 7 and the through hole 8 corresponding to the grain size 100 is formed.

The opening rough surface portion 6 of the plastic laminate film 2 is filled with the polyethylene material 10 of the polyethylene film 5 to be extruded and laminated in the recess 7 and the through hole 8 of the rough surface portion 9 formed in the biaxially oriented polypropylene film 4. As a result, the rough surface portion 6 for opening exhibits a smooth surface in appearance. The plastic laminate film 2 provided with the rough surface portion 6 for opening does not have much lower water vapor transmission rate or oxygen permeability than the packaging bag having the same configuration without the rough surface portion for opening, and therefore the rough surface portion 6 for opening is provided. The packaging bag molded with the plastic laminate film 2 provided with can enclose the contents restricted by moisture or the like.

In the pillow type packaging bag 1 shown in FIG.
The bent portion 1 is also provided at a portion adjacent to the joining end portion 3 in the center of the back surface.
4 is formed, and the bent portion 14 has the bent portion 1a.
The opening rough surface portion 15 similar to the opening rough surface portion 6 formed in FIG. That is, the plastic laminate film 2 that constitutes the pillow type packaging bag 1 is formed by bending the pillow type packaging bag 1 and forming a joint between the bent portion 1a formed at the side edge of the pillow type packaging bag and the center of the back surface. The rough surface portion 6 for opening and the rough surface portion 15 for opening are provided in a portion corresponding to the bent portion 14a formed in the portion adjacent to 3. Therefore, when the pillow type packaging bag 1 is opened in the direction of the arrow in FIG. 1, the opening rough surface portion 6 having a predetermined width is located at the mountain-folded bent portion 1a located at the opening start end side and has a predetermined width. The unsealed rough surface portion 15 is located in the bent portion 14 that is mountain-folded among the bent portions of the joining end portion 3. When the pillow type packaging bag 1 is opened in the direction of the arrow in FIG. 1, the valley-folded bent portion 1b can be easily opened during the opening of the pillow type packaging bag 1 in the direction of the arrow. It is not necessary to provide a rough surface portion for opening at the bent portion that is valley-folded. In order to enable the opening of the pillow type packaging bag 1 from either the left side or the right side, all of the bent portions at both sides and the joint end portion at the center of the back surface are to be opened. A rough surface portion for opening is formed.

The results of measuring the moisture permeability of the biaxially stretched polypropylene film 4 of the plastic laminated film 2 constituting the pillow-type packaging bag 1 are shown in the table below.

[Table 1] According to the measurement result of the water vapor transmission rate, when the rough surface portion 9 is formed on the bent portion of the pillow type packaging bag 1, the water vapor transmission rate becomes large, but by filling the through holes of the rough surface portion 9 with the polyethylene material, The moisture permeability is not so different as compared with a packaging bag without the surface portion 9, and it can be used for products that are resistant to moisture. Further, although the laminate film in which the rough surface portion 9 is filled with the plastic material has lower tensile strength and elongation as compared with the laminate film having no rough surface portion,
The pillow type packaging bag made of this material showed no significant difference between the two in the pressure resistance test and the drop test.

When the pillow type packaging bag 1 is opened in the direction of the arrow in FIG. 1, the opening rough surface portion 6 having a predetermined width is
Located at the mountain-folding bent portion 1a located on the opening start end side, the opening rough surface portion 15 having a predetermined width is located in the mountain-folded bending portion 14 of the bending portions of the joining end portion 3. Therefore, at the time of unsealing in the direction of the arrow from the unsealing start end side, a strong force is applied to the bent portion 1a by breaking the unstretched plastic film that is difficult to tear by using the unsealing rough surface portion provided on the stretched plastic film as the unsealing introduction portion. It can be easily done by hand without needing, and the cutting line extending from the bent portion 1a is
Even when reaching the central portion of the back surface and reaching the protruding joint end 3 which is difficult to open, the joint end is formed by the similar rough surface portion 15 for opening provided in the bent portion 14 of the folded portion of the joint end 3 The part 3 is also easily opened, and the cutting line obtained by cutting the joining end part 3 is
The mountain-folded bent portion 1a located on the opposite side from the joining end 3 and the mountain-folded bent portion 1a located on the opening start end side.
Since it extends linearly to b, the pillow type packaging bag 1 can be opened linearly.

FIG. 5 shows an embodiment in which the present invention is applied to a gusset bag. The gusset bag 20 has gusset portions 21a and 21b folded inward on both sides, and is folded inside the gusset portion 21 located on the opening start end side in the cutting direction (arrow) for opening. For opening the folded portions 22 and 23, the folded portion 24 located inside the other gusset portion 21b, and the folded portion 26 that is mountain-folded in the opening direction of the joint end portion 25 protruding to the outside. Rough surface portions 21a, 22a, 23
a, 24a, 26a are formed. As a result, it is possible to easily open the joint end portion that protrudes to the outside and is difficult to open.
Further, in the above embodiment, the opening rough surface portion is provided in the entire bent portion of the packaging bag 1 to be opened. However, the opening rough surface portion may be provided only in the portion to be opened. Of course, it may be of a layered structure.

[0021]

As described above, according to the present invention, a stretched plastic film in which a rough surface portion having a through hole is provided in a plastic laminate film with a predetermined width and an unstretched unstretched plastic film are used to form a rough surface portion for opening. It is configured by laminating so that this plastic laminated film has a stretched plastic film on the outside,
By fold-molding so that the opening rough surface portion is located only at the bending portion of the packaging bag, by breaking the unstretched plastic film that is difficult to tear as the opening rough surface portion provided on the stretched plastic film, It is possible to easily open from the bent portion of the packaging bag, and by covering the rough surface portion for opening provided on the stretched plastic film with the smooth surface of the unstretched plastic film, the moisture permeability of the rough surface portion for opening and By preventing the decrease of oxygen permeability, the product enclosed in the packaging bag is not restricted.

[Brief description of drawings]

FIG. 1 is a view showing an example in which a packaging bag according to the present invention is applied to a pillow type packaging bag 1.

FIG. 2 is a sectional view of a plastic film as a packaging bag material.

FIG. 3 is a cross-sectional view of a portion of the plastic film provided with an opening rough surface.

FIG. 4 is a diagram showing a rough surface forming device.

FIG. 5 is a view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Packaging Bag 1a Bent Part 2 Plastic Laminated Film 3 Joint End Part 4 Biaxially Stretched Polypropylene Film 6 Rough Surface Part for Opening 7 Recess 8 Through Hole 9 Rough Surface Part 10 Plastic Material 15 Rough Surface Part for Opening

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 62-52065 (JP, A) JP 61-142159 (JP, A) Actual opening 57-202970 (JP, U) Actual opening 56- 3842 (JP, U) US Patent 3608815 (US, A)

Claims (4)

(57) [Scope of utility model registration request] 1. A packaging bag in which a plastic laminate film having a rectangular shape is bent and formed, a joint end is heat-sealed to form a tubular portion, and an open end of the tubular portion is heat-sealed. The film, a predetermined width, is constituted by laminating a stretched plastic film provided with a rough surface portion having a through hole and an unstretched unstretched plastic film so as to form a rough surface portion for opening, this plastic laminate film, A packaging bag, characterized in that it is formed by bending so that the stretched plastic film is on the outside and the rough surface portion for opening is located only at the folding portion of the packaging bag. 2. The packaging bag according to claim 1, wherein the packaging bag is a pillow type packaging bag. 3. A plastic laminate film is formed by an extrusion laminating means in which a rough surface portion for opening is formed by at least a through hole provided in a stretched plastic film and an extrusion laminating means filled in at least a through hole of the rough surface portion. The packaging bag according to claim 1, wherein the packaging bag is made of a plastic material containing an anchoring agent. 4. The packaging bag according to claim 3, wherein the rough surface portion of the stretched plastic film is formed by pressure contact with sandpaper.