JP2001322675A - Overlap-sealing method and packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an overlap-sealing method and a packaging bag wherein the bag can be easily cut at an arbitrary portion. SOLUTION: A laminate sheet 1 comprising a laminate of a sealable base material layer 2 and a resin film 3 with tear directional properties is prepared. The sheet 1 is made into a cylinder wherein one of widthwise sides 4 of the sheet 1 is overlaid on the other side 5 by a predetermined width so that the base layer 2 is located inside. At least parts of overlaps 6 are heat-sealed with an adhesive 6a interposed between the overlaps 6. Thus, the overlap-sealing method and the packaging bag formed using the method are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overlapping sealing method and a wrapping bag applicable to a wrapping bag for food packaging, and more particularly to an lapping sealing method and a wrapping bag which can be easily cut at an arbitrary position.

[0002]

2. Description of the Related Art Hitherto, in a wrapping bag such as a yokan, a gasket type sealing method as shown in FIG. 3 has been adopted as a vertical sealing method (see paragraph No. 0013 of JP-A-8-337251). . That is, as shown in FIG. 3, the sealing method is a method in which both side portions of the packaging base material 50 are raised at the center and brought into contact with each other, and the rising portions 51 and 52 are heat-sealed to form a joint.

[0003]

However, in such a seal-type sealing method, a rising portion 5 extending in the longitudinal direction is required.
When cutting is performed with the cut portion 53 provided at the upper end of the first and second 52, for example, when cutting is performed in the direction a in the figure, the root line 54 at the rising portion in the direction b interferes with the cutting. If you try to cut in the direction, a
The root line at the rising part on the direction side hinders cutting. Therefore, there is a problem that the root line on the opposite side hinders the cutting in any direction.

[0004] Therefore, an object of the present invention is to provide a lap seal method and a wrapper which can be easily cut at any place.

[0005]

The above object is achieved by the following invention. 1. A laminated sheet is prepared by laminating a base material layer having a sealing property and a resin film having a tearing direction, and one side in the width direction of the laminated sheet is overlapped by a predetermined width on the other side. A lap sealing method comprising: forming a cylindrical shape so that a base material layer is located inside; and heat-sealing at least a part of the overlapping portion with an adhesive interposed therebetween. 2. 2. The method according to claim 1, wherein the method is applied to a gusset bag or a flat bag for food packaging. 3. 3. The method according to claim 1, wherein a portion of the overlapped sheet located outside the cylinder at the end of the laminated sheet is not bonded and / or heat-sealed. 4. The base material layer is composed of a metal foil layer and a polyethylene resin layer,
4. The method according to claim 1, wherein the polyethylene resin layer is an adhesive surface. 5. One side in the width direction of a laminated sheet formed by laminating a base material layer having a sealing property and a resin film provided with a tearing direction is overlapped by a predetermined width on the other side, and the base material layer is on the inside. As described above, wherein at least a part of the overlapping portion is heat-sealed with an adhesive interposed between the overlapping portions. 6. The wrapper according to claim 5, wherein the wrapper is applied to a gusset bag or a flat bag for food packaging. 7. 7. The wrapper according to claim 5, wherein a portion of the overlapped sheet located outside the cylinder at the end of the laminated sheet is not bonded and / or heat-sealed. 8. The base material layer is composed of a metal foil layer and a polyethylene resin layer,
The packaging bag according to claim 5, 6 or 7, wherein the polyethylene resin layer is an adhesive surface.

[0006]

Embodiments of the present invention will be described below.

FIG. 1 is a perspective view of a main part showing a preferred embodiment of the present invention, and FIG. 2 is a sectional view showing an example of a laminated sheet used in the present invention.

In the drawing, reference numeral 1 denotes a laminated sheet used in the present invention, and the laminated sheet 1 has a base material layer 2 having a sealing property.
And a resin film 3 to which a tearing directionality is given by, for example, thermal expansion.

The method for producing the laminated sheet 1 is not particularly limited, and examples thereof include various laminating methods and bonding with an adhesive.

The substrate layer 2 is not particularly limited as long as it has a sealing property, and examples thereof include a resin layer, a metal foil layer, and paper. Examples of the resin used for the resin layer include a polyethylene resin and a polypropylene resin, and preferably a low-density polyethylene resin.

The base layer 2 may be a laminated sheet comprising a metal foil layer and a polyethylene resin layer. Preferred examples of the metal foil include an aluminum foil. When laminating a metal foil layer and a polyethylene resin layer, it is preferable that the polyethylene resin layer is an adhesive surface.

Further, as the base material layer 2, a laminated sheet composed of a metal-deposited polyethylene resin layer can be used. As metal deposition, aluminum deposition is preferably mentioned.

The resin film 3 is a resin film having a tearing direction, and the tearing direction is the X direction in the drawing. In order to impart the tearing directionality, for example, there is a method such as thermal expansion, and a method such as uniaxial stretching is preferable. As the resin provided with the tear directionality, stretched polyethylene, stretched polypropylene, stretched polyester,
Stretched nylon and the like can be mentioned.

An example of the sealing method of the present invention will be described.
A laminated sheet 1 is prepared in advance by laminating a base material layer 2 having a sealing property and a resin film 3 to which a tearing direction has been imparted by, for example, thermal expansion. Next, as shown in FIG. 1, a laminated sheet 1 comprising a base material layer 2 and a resin film 3
The upper and lower sides 4 and 5 are overlapped. The overlapping portion 6 allows the resin film 3 to be disposed on the lower surface of the base material layer 2. Thus, a cylindrical body as shown in the figure is formed. The width of the overlapping portion 6 can be arbitrarily set as long as there is no problem in sealing.

Next, an adhesive 6a is interposed in the overlapping portion 6. The adhesive 6a can be applied to the back surface of the base layer 2 in advance. It is preferable that the adhesive is not applied to the area where the adhesive is applied, not to the entire overlapping portion shown in the drawing, but to the outside of the cylinder at the leading end of the laminated sheet in the overlapping portion. This is to make it easy to grasp when cutting. This non-bonded part is indicated by reference numeral 9 in the figure.

In the present invention, in order to further secure the sealing property, heat sealing is performed on the overlapping portion 6 except for the non-adhesive portion 9. The heat sealing method is not particularly limited.

The adhesive is not particularly limited as long as it can bond the resin films to each other. When applied to a food package, it is desirable to select and use an adhesive having no problem in food hygiene.

In the present invention, when paper or aluminum foil is used as the base material layer 2 having a sealing property, the heat sealing property with the resin film 3 is poor. Is preferably formed.

To obtain a wrapper using the above-mentioned sealing method,
In addition to the sealing in the longitudinal direction as shown, the upper and lower openings may be sealed.

In the present invention, cut portions 7 and 8 shown in FIG. 1 may be provided in order to more easily realize the cut property. The depth of the cut portion may be up to the heat seal portion, but may be shallower.

For example, two cut portions 7 and 8 are provided, and the leading end of the laminated sheet between the cut portions 7 and 8 is pulled in the X direction. In this example, the tension is easily formed due to the presence of the non-adhesion portion 9. By such easy cutting,
The contents can be taken out.

The wrapping bag of the present invention may be either a flat bag or a gusset bag, and may be used as a packaging bag for yokan or other foods.

The embodiment of the present invention has been described above.
The embodiment of the present invention is not limited to the above, and various modes can be adopted within the scope of the concept of the present invention.

[0024]

According to the present invention, it is possible to provide an overlay sealing method and a wrapper which can be easily cut at an arbitrary position.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing a preferred embodiment of the present invention.

FIG. 2 is a sectional view showing an example of a laminated sheet used in the present invention.

FIG. 3 shows a conventional example.

[Explanation of symbols]

 1: Laminated sheet 2: Base layer 3: Resin film 4, 5: Both sides 6: Overlap 6a: Adhesive 7, 8: Cut 9: Non-adhesion

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B29L 23:00 B29L 23:00 (72) Inventor Takeshi Suzuki 2173-64 Wakamatsucho, Wakaba-ku, Chiba-shi, Chiba F Term in the Shirakawa Plant Co., Ltd. (reference) 3E064 AA06 BA25 BB03 BC18 HN05 HP01 HP04 HP05 3E067 AA11 AB01 AC01 BA11A BA14A BB11A BB14A BB25A BC03A CA24 CA30 EA05 EA08 EA11 EB07 EB10 AD05 AD05 FC04 TD11 TH02 TH18 TN43

Claims (8)

[Claims] 1. A laminated sheet is prepared by laminating a base material layer having a sealing property and a resin film provided with a tearing direction, and one side of the laminated sheet in the width direction is placed on the other side by a predetermined amount. Overlapping by a width, forming a cylindrical shape so that the base material layer is on the inside, and heat-sealing at least a part of the overlapping portion by interposing an adhesive in the overlapping portion. . 2. The method according to claim 1, wherein the method is applied to a gusset bag or a flat bag for food packaging. 3. The method according to claim 1, wherein a portion of the overlapped sheet located outside the cylinder at the end of the laminated sheet is not bonded and / or heat-sealed. 4. The method according to claim 1, wherein the base material layer comprises a metal foil layer and a polyethylene resin layer, and the polyethylene resin layer is an adhesive surface. 5. A laminated sheet formed by laminating a base material layer having a sealing property and a resin film imparted with a tearing direction, wherein one side in the width direction is overlapped by a predetermined width on the other side. A wrapper formed in a cylindrical shape such that the layer is on the inside, and formed by heat-sealing at least a part of the overlapping portion with an adhesive interposed between the overlapping portions. 6. The wrapper according to claim 5, wherein the wrapper is applied to a gusset bag or a flat bag for food packaging. 7. The wrapper according to claim 5, wherein a portion of the overlapping sheet located outside the cylinder at the end of the laminated sheet is not bonded and / or heat-sealed. 8. The wrapper according to claim 5, wherein the base material layer comprises a metal foil layer and a polyethylene resin layer, and the polyethylene resin layer is an adhesive surface.