JPH10119931A - Sealing method for packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely seal openings of a packaging bag by a method wherein the leading end part of a heating member, which is pressed to a packaging material, is formed to be thin into a blade-shape, and both openings of the packaging bag are sealed into a thin line-shape by pressing the leading end part in the width direction of the packaging material. SOLUTION: Leading end parts 45a, 46a of heating members 45, 46 are formed to be thin into a blade-shape. At locations which confront with the leading end parts 45a, 46a of the heating members 45, 46 with openings 10e, 10f of a packaging bag 9 in-between, heat-resistant elastic members 48, 49 are fixed to respective upper corner parts of receiving bases 51, 52. When the openings 10e, 10f are respectively pinched between the leading end parts 45a, 46a and the elastic members 48, 49, and a concentrated load is applied to the openings 10e, 10f by the leading end parts 45, 46, the leading end parts 45a, 46a deeply bite into the openings 10e, 10f linearly, and the openings 10e, 10f which have a step in the width direction are linearly sealed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for sealing a packaging bag, and more particularly to a method for sealing a packaging bag for storing a work such as a film unit with a lens.

[0002]

2. Description of the Related Art Film units with a lens such as "Sharp Run Super Slim" (product name) are commercially available so that photographers can easily enjoy photography at low cost. Such a film unit with a lens is generally widely used because it is easy to take a photograph immediately at the place where the lens is purchased, and it is easy to leave the film unit as it is at a development dealer.

[0003] In such a film unit with a lens, a photographic film is loaded in a manufacturing process. Therefore, the photographic film loaded is protected from moisture and dust until it is actually used by a user after manufacturing. Need to be kept. For this reason, each film unit with a lens is packed in a moisture-proof packaging bag when shipped from the manufacturer.
The packaging bag is opened by the user when used.

[0004] In such a packaging bag, a film unit with a lens is placed on a single sheet of packaging material, and opposing edges of the packaging material are joined to form a cylinder. This is a so-called three-sided pillow packaging bag that seals both openings of the packaging material. The packaging material used for this packaging bag is usually a thin aluminum sheet laminated with several layers of transparent polyethylene, polyethylene terephthalate, ethylene vinyl acetate and the like.

[0005]

By the way, as shown in FIGS. 10, 11, and 12, a packaging material 1 formed in a cylindrical shape is used.
In order to fold the opening 101 of the “00” flat, the packaging material 1
00, a central portion 102 of a pair of opposed surfaces 102, 103
While the a and 103a are folded inward, the other pair of surfaces 104 and 105 is sandwiched between the heating member 106 and the receiving base 107 and crushed. Therefore, the opening 10
On both sides of one, four packaging materials 100 are superimposed.

However, when the packaging material 100 is formed into a tubular shape in the previous step, the facing edges 100a, 100b
Are joined, if this joined portion overlaps with either one of both sides of the opening 101, the portion will be overlapped by six sheets. That is, in the width direction of the opening 101, two sheets, four
And six superimposed portions P ₁ , P ₂ and P ₃ are formed,
Steps occur at these boundaries, and in the heating member 106 having a flat sealing surface, a gap is formed at each step, and the opening 101 cannot be completely sealed. In order to improve this, for example, it is conceivable to use a stepped heating member in accordance with the step shape, but if the relative position between the heating member and each step is shifted in the width direction, a gap may be generated instead. There is a disadvantage that it becomes noticeable. Reference numeral 99 in the drawing indicates a film unit with a lens.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for sealing a packaging bag which can reliably seal the opening of the packaging bag.

[0008]

In order to achieve the above-mentioned object, a method for sealing a packaging bag according to the present invention comprises forming a cylindrical shape by overlapping and joining opposite parallel edges of a sheet-like packaging material. After crushing the other pair of surfaces while folding the opening of both sides of the formed packaging material inward at the center of the pair of surfaces facing each other, heating and pressing this crushed surface with a heating member. In a method for sealing a packaging bag to be sealed by sealing, a tip portion of the heating member pressed against the packaging material is formed in a thin blade-like shape, and is pressed in the width direction of the packaging material to narrow the opening portions. It is designed to seal linearly.

Further, according to the method for sealing a packaging bag of the present invention, both openings of a cylindrically formed packaging material are opposed to each other by overlapping and joining opposite parallel edges of a sheet-like packaging material. A method of sealing a packaging bag in which a central portion of one set of surfaces is folded inward while the other set of surfaces is crushed, and the crushed surface is heated and pressed by a heating member and sealed by sealing. A first sealing step of pressing a first heating member having a thin end portion pressed against the packaging material in a blade shape in the width direction of the packaging material to seal both the openings in a thin line shape; Then, a second sealing step of pressing a second heating member having a flat sealing surface against substantially the entire surface of both of the openings to seal both the openings in a planar shape is provided.

Further, in the method for sealing a packaging bag according to the present invention, a heat-resistant elastic member is disposed at a position opposed to the heating member having the tip portion formed into a thin blade-like shape with the opening portions interposed therebetween. The distal end portion of the heating member is cut into the member with the opening portions interposed therebetween.

[0011]

In FIG. 2, a film unit with a lens 11 is placed at a predetermined interval on a sheet-like packaging material 10 made of a moisture-proof thermoplastic resin.
Opposite parallel edges 10a and 10b of the packaging material 10 are overlapped at a corner 11a of the film unit 11 with a lens by a well-known pillow packaging machine, and edge-sealed. Due to this edge seal, one side surface 10c of the packaging material 10 becomes flush with the surface of the edge 10b.
The seal positions in the width direction of 0a and 10b are determined more stably than the conventional center seal.

The first nip rollers 13 and 14, the edge sealers 15 and 16, the weight rollers 17 and 18, the folding rollers 21 and
22, and second nip rollers 23 and 24 are arranged in a straight line. Except for the folding rollers 21 and 22, guide plates 25, between the first nip rollers 13 and 14, the edge sealers 15 and 16, the basis rollers 17 and 18, and the second nip rollers 23 and 24 and the upper surface 10 d of the packaging material 10. 2
6, 27, 28 are provided horizontally.

Between the guide plates 25 and 26 and the guide plate 2
7 and 28 are widely separated from each other, and folding rollers 21 and 22 are arranged between the respective members. As a result, the folding roller 21, the thickness of the guide plates 25 to 28,
The lower surface of 22 is made to approach the upper surface 10 d of the packaging material 10. Further, a gap slightly wider than two packaging materials 10 is provided in a straight line between the guide plates 25 and 27 and between the guide plates 26 and 28, and the edges 10a and 10b pass through these gaps. It is supposed to be. An elongated prismatic work positioning guide 31 is disposed below the guide plates 27 and 28 to regulate the lateral position of the lens-fitted film unit 11. In addition, a concave portion 31 a is formed in an upper portion of the work positioning guide 31 corresponding to the folding roller 22.

As shown in FIG.
0c, the side position is regulated by the work positioning guide 31, and the edges 10a, 10b of the packaging material 10 are first nip rollers 13, 14, the second nip roller 23,
The edge portions 10a and 10b are joined by being heated and pressed from both sides by a pair of edge sealers 15 and 16 while being conveyed while being sandwiched by 24. The joined portion is then pressed by the weighting rollers 17 and 18, and the edge 1 is formed by the peripheral surface of the weighting roller 18 on which, for example, a grid-like notch is formed.
A grid pattern 20 (see FIG. 5) is put outside of Ob.
Thereby, the joining strength of the edges 10a and 10b is enhanced.

As shown in FIG. 4, the folding rollers 21, 22
A fold line 33 is formed at the base of the edge seal portion 35 composed of the joined edges 10a and 10b, and the edge seal portion 35
Is provided to make it easy to fall down to the upper surface 10d side with the edge portion 10a side inward. A convex portion 21a having a triangular cross section is formed at the lower part of the peripheral surface of one folding line roller 21 and the other folding line roller is formed. A concave portion 22a for receiving the protrusion 21a is formed at a lower portion of the peripheral surface of the tube 22.

The edge seal portion 35 is laid down so that the edge portion 10a comes into close contact with the upper surface 10d of the packaging material 10 in the next step. Thereafter, as shown in FIG. 5, the central portions 37a, 38a of the left and right side surfaces 37, 38 of the packaging material 10 between the front and rear lens-fitted film units 11 are folded inward while the upper and lower surfaces 39, 40 are raised and lowered. After being crushed from the direction, it is temporarily fixed by a partial seal. continue,
The packaging material 10 is cut in the width direction at a predetermined position P at different distances to the film unit with lens 11 before and after the upper and lower surfaces 39 and 40, and the packaging bag 9 in which the film units with lens 11 are stored one by one. become. The hatched areas indicated by reference numerals 41 to 44 represent partial seal areas.

The packaging bag 9 is transported to a sealing line for completely sealing the openings 10e and 10f formed by the cutting. In the hermetic sealing line, first, pressure is applied from the outside of the packaging bag 9 to discharge air from the inside of the packaging bag 9, and a line seal is applied to the openings 10e and 10f in the width direction. As shown in FIG. 1, this line sealing is performed by using heating members 45 and 46 whose tip portions 45a and 46a are formed thin like blades. Tip portions 45a, 4
6a, heat-resistant elastic members 48 and 49 made of, for example, silicone rubber are provided on the receiving tables 51 and 5 respectively.
2 is fixed to each upper corner.

The packaging bag 9 conveyed to the hermetic sealing line has one opening 10e in which the heating member 45 and the pedestal 5
1 and the other opening 10f is positioned so as to be between the heating member 46 and the pedestal 52.
5 and 46 start moving downward, and the receiving tables 51 and 52 start moving upward. The predetermined positions of the openings 10e and 10f near the lens-fitted film unit 11 correspond to the leading end 4 respectively.
5a and the elastic member 48, and between the distal end 46a and the elastic member 49, are heated and pressed in a linear shape extending in the width direction. This situation will be described with reference to FIGS.

In FIG. 6, which shows the opening 10e from the front, the opening 10e has a different thickness in the width direction (the left-right direction in the drawing). In the central portion 54 of the opening 10e, the packaging material 10
Layer 55, but one edge 55 is wrapped with
Is folded in two, so that it has four layers, and the other edge 5
6 has six layers of the packaging material 10 because the edge seal portion 35 overlaps the folded side surface 38. Since the opening 10f is the same as the opening 10e, the description is omitted.

As shown in FIG. 7, when a concentrated load is applied by sandwiching the opening 10e between the distal end 45a of the heating member 45 and the elastic member 48, the distal end 45a is formed in a thin blade shape. And the elastic member 48 is deformed according to the step of the opening 10e, so that the distal end 45a extends over the entire width of the opening 10e.
From all over the opening 10e. In addition, since the elastic member 48 moderates excessive biting of the distal end portion 45a by moderate elasticity, the opening 1 is formed by the distal end portion 45a.
0e is prevented from being cut. The opening 10f is completely the same as the opening 10e. As a result, as shown in FIG. 1, the line seal marks 58,
59 are formed, and the openings 10e and 10f are securely sealed.

After the line sealing is completed, as shown in FIG. 8, the openings 10e and 10f are heated and pressurized by heating members 61 and 62 having flat sealing surfaces, and the entire surface is sealed. At positions opposed to the heating members 61 and 62 with the openings 10e and 10f interposed therebetween, respectively,
64 are arranged. After this entire seal is finished,
The openings 10e and 10f are pressurized by, for example, a cooling block in which grid-shaped notches are formed, and as shown in FIG.

Thereafter, the longer opening 10e of the packaging bag 9 is formed.
Is formed with an opening for hanging the packaging bag 9 on a hook or the like. Then, a predetermined number of the packaging bags 9 are packed together and shipped.

In the embodiment described above, a film unit with a lens is used as a work to be packaged in a packaging bag. However, the present invention is not limited to this. For example, a photographic film cartridge may be used.

[0024]

As described above, according to the packaging bag sealing method of the present invention, the distal end of the heating member is formed into a thin blade-like shape, and is pressed in the width direction of the packaging material to open both openings. Since the sealing is performed in a thin line shape, the tip of the heating member can be deeply cut into the packaging material, and the opening can be reliably sealed even if the thickness of the opening varies in the width direction. .

A first sealing step of pressing a first heating member having a thin tip into a blade shape in the width direction of the packaging material to seal both openings in a thin line shape, and thereafter, a flat sealing surface And a second sealing step of pressing the second heating member having substantially the entire surface of both openings to seal both openings in a planar manner, so that the two openings having steps can be securely sealed, Almost the entire surface of both openings can be flattened, and both openings can be finished with good appearance.

Heating and pressurizing both openings with the opening sandwiched between a heating member having a thin tip end and a heat-resistant elastic member. Cutting both openings. In addition, the distal end of the heating member can be deeply cut into both openings, and both openings can be reliably sealed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a state where both openings of a packaging material according to the present invention are line-sealed.

FIG. 2 is a perspective view showing a part of a pillow packaging machine for forming a sheet-like packaging material into a cylindrical shape.

FIG. 3 is an explanatory view showing a state in which edges of a packaging material are joined by an edge sealer.

FIG. 4 is an explanatory diagram showing a state where a fold line is formed at the base of an edge seal portion by a fold line roller.

FIG. 5 is an explanatory view showing formation of an opening.

FIG. 6 is an explanatory diagram showing an opening immediately before line sealing.

FIG. 7 is an explanatory view showing an opening in a line seal.

FIG. 8 is an explanatory view showing a state in which both openings of the packaging material are surface-sealed.

FIG. 9 is an overhead view showing a packaging material in which both openings are surface-sealed.

FIG. 10 is an explanatory view showing an opening of the packaging material before being folded flat.

FIG. 11 is an explanatory view showing a state where the opening shown in FIG. 10 is folded.

FIG. 12 is an explanatory view showing a state in which the opening shown in FIG. 11 is sealed by a conventional method.

[Explanation of symbols]

 9 Packaging bag 10 Packaging material 10a, 10b Edge 10e, 10f Opening 11 Film unit with lens 15, 16 Edge sealer 21, 22 Folding roller 31 Work positioning guide 33 Folding line 35 Edge seal 41-44 Partial seal area 45, 46, 61, 62 Heating member 45a, 46a Tip part 48, 49 Elastic member 51, 52, 63, 64 Receiving stand 58, 59 Line seal mark 66, 67 Surface seal mark

Claims (3)

[Claims] 1. An opening of a cylindrical packaging material formed by overlapping and joining opposing parallel edges of a sheet-like packaging material so that a central portion of a pair of opposing surfaces is inward. A method of sealing a packaging bag in which the other set of surfaces is crushed while being folded, and the crushed surface is sealed by heating and pressing with a heating member, thereby sealing the packaging material of the heating member. A method of sealing a packaging bag, characterized in that a tip portion to be formed is formed into a thin blade-like shape, and this is pressed in the width direction of the packaging material to seal the two openings in a thin line shape. 2. An opening of a cylindrical packaging material formed by overlapping and joining opposing parallel edges of a sheet-like packaging material so that the center of a pair of opposing surfaces is inward. A method of sealing a packaging bag in which the other set of surfaces is crushed while being folded, and then the crushed surfaces are heated and pressed by a heating member to seal them. A first sealing step of pressing the first heating member, which is thinly formed into a blade shape, in the width direction of the packaging material to seal the openings in a thin line shape,
Thereafter, a second sealing step of pressing a second heating member having a flat sealing surface against substantially the entire surface of both openings to seal both openings in a planar shape is provided. Sealing method. 3. A heat-resistant elastic member is disposed at a position opposed to the heating member having the tip portion formed in a thin blade shape and sandwiching the opening portions, and the tip portion of the heating member is disposed on the elastic member. The method for sealing a packaging bag according to claim 1 or 2, wherein the packaging bag is bitten across both openings.