JP6124842B2 - Packaging bag - Google Patents

Description

  The present invention relates to a packaging bag.

  2. Description of the Related Art Conventionally, there has been known a packaging bag configured such that a gusset portion is provided at the bottom and the gusset portion expands to increase the volume inside the bag and accommodate a large amount of objects (see Patent Document 1).

JP 2009-18814 A

In the packaging bag described in Patent Document 1, the upper end edge in a state where the front and back sheets are overlapped is sealed by welding, and when opening, a part of the upper end edge is cut off from the notch to form an opening. It was a thing. After opening, the front and back sheets are sealed together using a fastener so that the opening can be opened and closed.
However, there is a drawback in that waste strips are generated due to the strip-like cut edge of the upper edge that is cut off, and waste is generated. Further, when opening, a part of the upper edge is torn and cut by hand, so the cut surface is often non-linear, and even if it is used after being opened and sealed with a fastener, the appearance is poor.

  Moreover, the packaging bag described in Patent Document 1 is configured with a plurality of sheet pieces, and it is difficult to attach a small sheet piece forming a gusset portion by welding on the inner side of the lower end edge portion. Accordingly, there is a drawback that the work related to the manufacturing becomes complicated and the cost increases.

  Then, an object of this invention is to provide the packaging bag which does not generate | occur | produce a waste disposal material and can be manufactured cheaply.

The packaging bag according to the present invention is a first sheet in which one synthetic resin rectangular sheet piece is folded at two fold- fold fold curves and one valley-fold fold curve to form an M-shaped longitudinal section. bent portion sequentially with a layer-second sheet layer, the third sheet layer, the fourth sheet layer is formed on the upper edge, and left and right end edge portions are welded, the table Te side sheet end of the sheet piece An opening for placing an article to be packaged is formed at the lower end edge portion by the portion and the back side sheet end, and the bent portion has the first sheet layer and the second sheet layer formed of the valley fold-shaped folding curve. The third sheet layer and the fourth sheet layer are welded in the vicinity of the valley fold fold, and a fastener capable of sealing the second sheet layer and the third sheet layer to each other is attached. Furthermore, along the above-mentioned valley fold-shaped curve, closer to the inside of the bag than the fastener. Te, the second sheet layer and the third sheet layer capable severing a breakable line portion is formed, at least one of the tables Te side sheet end and the back side sheet end portion, convex fold and valley fold It is bent at a line, and a bottom flange is formed at the lower edge.

Moreover, the said bottom collar part is formed by bending both the above-mentioned display side sheet | seat edge part and the said back side sheet | seat edge part by the mountain fold line and the valley fold line .
Moreover, in the said lower end edge part, the opening edge part of the said opening part is an extending | stretching shape to a position below the said mountain fold line .

  According to the packaging bag of the present invention, a three-dimensional bag shape is formed by expanding the bottom collar portion, the internal capacity is increased, a large amount of packages can be accommodated, and the table can be stood in a stable posture. . It can be opened by tearing the sheet piece without cutting off the upper edge, without generating waste material, and can be used with good appearance after opening. Moreover, although it is a structure provided with the bottom flange, it can be manufactured at low cost. The strength of the upper edge is ensured and the handling is convenient.

It is the front view which showed one Embodiment of this invention. It is the longitudinal cross-sectional view which showed one Embodiment of this invention. It is the longitudinal cross-sectional view which showed other embodiment of this invention. It is the front view which showed another embodiment of this invention. It is an expanded sectional view of the use condition which welds and seals a lower end edge part.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
As shown in FIGS. 1 and 2, the packaging bag of the present invention has a folded portion 10 in which a single sheet of rectangular sheet 1 made of synthetic resin is folded at a plurality of lateral folding lines 18, 19, 20. It is formed on the upper edge 1A. Specifically, when the sheet piece 1 is bent at two mountain fold-shaped fold curves 18 and 20 and one valley fold-shaped fold curve 19, the bent portion 10 has an M-shaped longitudinal section. The first sheet layer 11, the second sheet layer 12, the third sheet layer 13, and the fourth sheet layer 14 are sequentially provided. In the bent portion 10, the first sheet layer 11 and the second sheet layer 12 are welded and the third sheet layer 13 and the fourth sheet layer 14 are welded, and further, the second sheet layer 12 and the third sheet layer 13 are welded. A planned fracture line portion 5 capable of separating the second sheet layer 12 and the third sheet layer 13 is formed along a valley fold folding line 19 therebetween.

In a state where the bent portion 10 is formed on the upper edge 1A, the left and right edge portions 1B and 1B are welded, and the package piece Z is formed by the front sheet end 16 and the back sheet end 17 of the sheet piece 1. An opening 3 is formed in the lower edge 1C. Thus, the packaging bag main body 6 is formed with one piece of the synthetic resin rectangular sheet piece 1. That is, since the packaging bag main body 6 is formed by bending one sheet piece 1 and welding a small number of points between the sheet pieces 1, the manufacturing is easy and there is an advantage that it can be manufactured at low cost. In addition, the packaging bag main body 6 has an upper edge 1 </ b> A having a bent portion 10 as a planned opening portion, and a fastener 4 (and a slider 8) described later is attached to the bent portion 10. The opening 3 is sealed by welding after the article to be packaged Z is inserted.
The sheet piece 1 can use polyolefin resin, such as polyethylene and polypropylene. PET resin or nylon may be used. Examples of the packaged goods Z include foodstuffs, medicines, supplements, pet foods, and small items such as cosmetics and miscellaneous goods. In the present invention, the term “welding” refers to a process in which resins are bonded to each other without applying an adhesive by applying heat and pressing force, which is referred to as “thermocompression bonding” or “thermal welding”. You can also.

In FIG. 2, (at least) one of the front side sheet end 16 and the back side sheet end 17 of the sheet piece 1 is folded at a mountain fold line 21 and a valley fold line 22, and the bottom edge 30 is formed on the lower edge 1 </ b> C. Is formed.
The bottom ridge portion 30 is configured such that the mountain fold line 21 and the valley fold line 22 are expanded, the thickness of the bag is increased, and the volume inside the bag is increased. That is, the bottom gutter part 30 can be rephrased as a “gazette part”, and the bag shape becomes three-dimensional as the bottom gutter part 30 expands, and there is an advantage that a large amount of the packaged goods Z can be accommodated therein.

In the lower end edge 1 </ b> C, the opening edge 3 </ b> A of the opening 3 is formed to extend downward from the mountain fold line 21.
The mountain fold line 21 of the side sheet end 16 and the opening edge 3A of the opening 3 are different in vertical position, and a step S (in the vertical direction) is provided between them. . With this configuration, as shown in FIG. 5, when welding is performed with the side sheet end 16 and the back sheet end 17 sandwiched between the pair of welding means 25, 25, heat and pressure are concentrated in the vicinity of the opening 3. Pressure can be applied to seal. That is, it is easy to weld the side sheet end portion 16 and the back side sheet end portion 17, and the work of sealing the opening 3 can be simplified.

A fastener 4 capable of sealing the second sheet layer 12 and the third sheet layer 13 to each other is attached, and a planned break line portion 5 is disposed closer to the inside of the bag than the fastener 4.
The fastener 4 includes a chuck tape male part having a convex part and a chuck tape female part having a concave part into which the convex part is fitted, and both the chuck tape male part and the chuck tape female part are the second sheet layer 12 and the second sheet layer 12. It welds so that a convex part and a recessed part may be made to oppose to the inner side surface of the mountain fold-like folding lines 18 and 20 vicinity of the 3 sheet | seat layer 13. FIG. The fastener 4 holds the outer surface (the first sheet layer 11 and the fourth sheet layer 14) of the bent portion 10 with a finger from the outside, and presses the male portion of the chuck tape and the female portion of the chuck tape together to form the convex portion and the concave portion. The second sheet layer 12 and the third sheet layer 13 can be connected and sealed. Conversely, the first sheet layer 11 and the second sheet layer 12 near the fold-fold fold curve 18 and the third sheet layer 13 and the fourth sheet layer 14 near the fold-fold fold curve 20 are grasped and opened. By pulling in this manner, the fitting between the convex portion and the concave portion can be released and the fastener 4 can be opened.

In the bent portion 10 of the upper edge 1A, the first sheet layer 11 and the second sheet layer 12 are welded in the vicinity of the valley fold-shaped fold curve 19 to form a belt-like welded portion 15 that is elongated in the left-right direction. ing. Further, the third sheet layer 13 and the fourth sheet layer 14 are welded in the vicinity of the valley fold-shaped folding line 19 to form a belt-like welded portion 15 elongated in the left-right direction.
In the planned break line portion 5, a V-shaped groove having a depth of 1/3 of the thickness dimension of the sheet piece 1 is formed linearly along the valley fold-shaped folding line 19, whereby the sheet piece 1 It is easier to tear than other parts. In addition, it is also preferable to form a half cut groove or a perforation as the planned break line portion 5.

FIG. 3 shows another embodiment of the present invention.
In FIG. 3, both the front side sheet end 16 and the back side sheet end 17 of the sheet piece 1 are bent at a mountain fold line 21 and a valley fold line 22, and a bottom collar part 30 is formed at the lower end edge 1 </ b> C. ing.
Both the side sheet end 16 and the back sheet end 17 are folded so that the bottom collar 30 can be greatly expanded to greatly increase the volume inside the bag. More can be accommodated.

Next, another embodiment of the present invention will be described.
As shown in FIG. 4, a slider 8 for opening and closing the fastener 4 is attached to the bent portion 10.
The slider 8 is composed of two plastic parts, and one part serves to open the fastener 4 and the other part serves to close the fastener 4. The slider 8 is configured to be easily attached to the fastener 4 as a structure in which two parts are combined. In FIG. 4, since the planned break line portion 5 is provided closer to the inside of the bag than the fastener 4, the slider 8 is not affected before and after opening. For example, in the conventional packaging bag, since a part of the upper edge is cut off, either the slider cannot be provided or the slider is retrofitted after opening, but when the slider is retrofitted The cut surface was rattling (non-linear) and it was difficult to run the slider smoothly. On the other hand, according to the present invention, the slider 8 can be attached to the bent portion 10 before opening, and the fastener 4 can be easily opened and closed by the slider 8 before and after opening. .
In FIG. 4, the fastener 4 is attached at a position closer to the mountain fold-shaped folding lines 18 and 20. Other configurations are the same as those of the above-described embodiment.

The use method (action) of the packaging bag of the present invention described above will be described.
Since the opening 3 is formed in the lower end edge 1 </ b> C, the bag to be packaged Z is filled from the opening 3. At this time, the fracture line portion 5 is left without breaking the valley fold curve 19 of the upper edge 1A. After the article to be packaged Z is inserted and accommodated from the opening 3, as shown in FIG. 5, the opening 3 of the lower end edge 1C is welded and sealed to obtain a sealed state before opening. At this time, the two side sheet end portions 16 and the back side sheet end portion 17 are overlapped, and are sandwiched by the welding means 25 and 25, and are welded by applying heat and pressing force. In the sealed state before opening, the article to be packaged Z accommodated in the bag is protected from moisture, or is prevented from being dried and protected hygienically. By accommodating the article Z to be packaged inside the bag, the bottom collar 30 is expanded, the bag shape becomes three-dimensional, and the volume inside the bag increases. Therefore, compared with the thing in which the bottom collar part 30 is not provided, many to-be-packaged goods Z can be accommodated in a bag inside.

  Next, although not shown in the drawing, the zigzag folding lines 18 and 20 at the upper edge 1A are pulled to open the fastener 4, and the bent portion 10 (second sheet layer 12 and third sheet layer 13) is greatly expanded. When opened, the second sheet layer 12 and the third sheet layer 13 are separated along the planned fracture line portion 5 (valley fold-shaped folding line 19), and the packaged item Z can be taken out. The first sheet layer 11 and the second sheet layer 12 are welded (at the welded portion 15 in the vicinity of the planned fracture line portion 5), and the third sheet layer 13 and the fourth sheet layer 14 are (in the vicinity of the planned fracture line portion 5). In the case of taking out the article to be packaged Z, between the first sheet layer 11 and the second sheet layer 12 or between the third sheet layer 13 and the fourth sheet layer 14. In addition, the article to be packaged Z can be prevented from entering, and the article to be packaged Z is not caught by the second sheet layer 12 and the third sheet layer 13 and difficult to take out. Once in the opened state, the airtightness is not as high as that before opening, but the fastener 4 can be closed to be in a semi-sealed state.

The manufacturing method of the packaging bag of this invention is demonstrated easily.
The fastener 4 is attached to the surface of the original sheet while continuously feeding the original sheet made of synthetic resin. In the preceding process, various characters, figures, symbols, patterns, etc. have already been printed on the surface of the original sheet. Next, a heated blade is applied to the surface of the raw sheet to form a V-shaped groove. The planned break line portion 5 is formed with this V-shaped groove. Next, the original sheet is folded at two intermediate fold-shaped fold curves 18, 20 and one valley-fold fold curve 19, and at least one of the end portions of the original sheet is fold-folded. Fold at 21 and valley fold line 22. The steps up to here are performed while continuously feeding the raw sheet. That is, a portion (the end portion of the sheet folded at the mountain fold line 21 and the valley fold line 22) that is expected to become the bottom ridge portion 30 does not need to be welded and is formed by folding one original sheet. Therefore, since the raw sheet can be formed while being continuously fed, the production efficiency is good and the cost can be kept low.

  From the state where the original fabric sheet is bent at a plurality of locations as described above, while intermittently feeding the original fabric sheet, the first sheet layer 11 and the second sheet layer 12 are welded at one end edge of the original fabric sheet, And the 3rd sheet layer 13 and the 4th sheet layer 14 are welded, and the bending part 10 is formed. And a welding part is formed along the width direction of an original fabric sheet | seat, and an original fabric sheet is cut | disconnected in the intermediate position of this welding part. In this way, the packaging bag of the present invention is manufactured.

  The present invention can be changed in design. For example, the slider 8 is not limited to the above-described configuration, and can be changed.

  As described above, in the packaging bag according to the present invention, the bent portion 10 formed by bending one synthetic resin rectangular sheet piece 1 at a plurality of lateral folding lines 18, 19, 20 is the upper edge 1A. The left and right edge portions 1B and 1B are welded to each other, and the opening 3 for putting the article to be packaged Z is formed at the lower edge by the front side sheet end 16 and the back side sheet end 17 of the sheet piece 1. 1C, at least one of the side sheet end 16 and the back sheet end 17 is folded at a mountain fold line 21 and a valley fold line 22, and a bottom collar 30 is formed at the lower edge 1C. Therefore, the three-dimensional bag shape is formed by the expansion of the bottom flange portion 30, the internal capacity is increased, and a large amount of articles to be packaged Z can be accommodated and can be stably placed on a table or the like. The sheet piece 1 can be broken and opened without cutting off the upper edge 1A, no waste material is generated, and it can be used after opening. Moreover, although it is the structure in which the bottom collar part 30 was provided, it can manufacture at low cost. The strength of the upper edge 1A is ensured, and it is easy to use.

  Further, the bent portion 10 has a first sheet layer 11, a second sheet layer 12, a third sheet layer 13, and a fourth sheet layer 14 that have an M-shaped longitudinal section in order. The second sheet layer 12 is welded and the third sheet layer 13 and the fourth sheet layer 14 are welded. Further, the second sheet layer 12 is welded along the valley fold folding line 19 between the second sheet layer 12 and the third sheet layer 13. Since the planned break line portion 5 capable of separating the sheet layer 12 and the third sheet layer 13 is formed, the sheet piece 1 is torn and opened at the planned break line portion 5 along the valley folding line 19. It can be used without any waste material and can be used after opening. When taking out the package Z, the package Z can be prevented from entering between the first sheet layer 11 and the second sheet layer 12 or between the third sheet layer 13 and the fourth sheet layer 14. . The strength of the upper edge portion 1A is ensured, and opening and removal of the packaged item Z can be easily performed.

  Further, in the lower end edge portion 1C, the opening edge portion 3A of the opening portion 3 extends from the mountain fold line 21 to a position below the mountain fold line 21, so that the side sheet end portion 16 and the back sheet end portion 17 are welded. The heat can be easily sealed by applying heat and pressing force intensively in the vicinity of the opening 3. The operation | work which seals the opening part 3 can be simplified.

  In addition, a fastener 4 capable of sealing the second sheet layer 12 and the third sheet layer 13 to each other is attached, and a planned break line portion 5 is disposed closer to the inside of the bag than the fastener 4, so that it can be folded before opening. The slider 8 can be attached to the curved portion 10, and the fastener 4 can be easily opened and closed by the slider 8 before and after opening. The sheet piece 1 can be broken and opened at the planned break line portion 5 and can be used with good appearance even after opening. In particular, the fastener 4 can be used in a sealed state, which is convenient.

DESCRIPTION OF SYMBOLS 1 Sheet piece 1A Upper end edge part 1B Left and right both-ends edge part 1C Lower end edge part 3 Opening part 3A Opening edge part 4 Fastener 5 Planned break line part 10 Bending part 11 1st sheet layer 12 2nd sheet layer 13 3rd sheet layer 14 4th sheet layer 16 Front side sheet edge part 17 Back side sheet edge part 18 Folding curve 19 Folding curve 20 Folding curve 21 Mountain fold line 22 Valley fold line 30 Bottom ridge part Z Package

Claims (3)

One piece of rectangular sheet (1) made of synthetic resin is folded at two mountain folds (18 ) and ( 20) and one valley fold (19) , and has an M-shaped longitudinal section. The bent portion (10) having the first sheet layer (11), the second sheet layer (12), the third sheet layer (13), and the fourth sheet layer (14) in order is formed on the upper edge (1A). The left and right edge portions (1B) and (1B) are welded, and an object to be packaged (Z) is formed by the front side sheet end (16) and the back side sheet end (17) of the sheet piece (1). ) Is formed in the lower edge (1C),
In the bent portion (10), the first sheet layer (11) and the second sheet layer (12) are welded in the vicinity of the valley-folded folding line (19) and the third sheet layer (13 ) And the fourth sheet layer (14) are welded in the vicinity of the valley fold-shaped folding line (19), and the second sheet layer (12) and the third sheet layer (13) can be sealed to each other. (4) is attached, and further, the second sheet layer (12) and the third sheet layer (13) along the valley fold-shaped folding line (19), closer to the inside of the bag than the fastener (4). ) Is planned to be broken, and a line portion (5) to be broken is formed.
At least one of the front side sheet end (16) and the back side sheet end (17) is bent at a mountain fold line (21) and a valley fold line (22), and the bottom edge (1C) is bottom. A packaging bag in which a collar part (30) is formed. The bottom flange (30) is formed by folding both the front side sheet end (16) and the back side sheet end (17) at a mountain fold line (21) and a valley fold line (22). packaging bag of claim 1 wherein being.   The packaging bag according to claim 1 or 2, wherein the opening edge (3A) of the opening (3) is extended to a position below the mountain fold line (21) at the lower edge (1C).

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